Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fc0a1f5f6b5860…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 01:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 936887c36bd9018a67a56b9dcde7525d SHA-1: b7b911ae5c70a6b3880720730d5b436308e39a25 SHA-256: c4fc0a1f5f6b5860a7c651238d8a8289f62e6f1b08a5c8bc120bd06f8eb5d300
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to external resources, some of which point to compromised WordPress sites. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to lure the user into clicking a link, likely to download a secondary payload. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160776dd892439---tazararafanadig.pdf In PDF document text
    • https://musikkursus.dk/userfiles/file/40129453187.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/97921588796.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/gulewekigovuwegolagu.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mkn6p1lrrki1fj679rpugaova7/18931435286.pdfIn PDF document text
    • http://arslanemlak.come/file/5532418062.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ca21c79e072e62bb9ed353998d41ce90/wefetipezironevegevewux.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d1968da4ced1ae9fad03e656256764e5/61938727446.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/piwirupobipovik.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/6d4ns5t464i2p4uc22hsh8rr13/sazem.pdfIn PDF document text
    • http://boxethai38.comupload/file/78188946313.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/64bf83c3f5d1f7966ee96ba8a60d8090/77560181814.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/97417930559.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/4521e3c7889d80df0ff1832d32d819f3/deboterufe.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/diduwumidivuza.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af552607a52---59687590979.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/5euespg54e7ll2t1gdbpak2fat/pulawakiperejevub.pdfIn PDF document text
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/jigimavelezarogu.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/nekusesox.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/zogasagisaxotakuke.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16076883f3ffbb---39427884741.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af335c7bb5---depezutedovakeva.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed99954ba---wijumadamomin.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d32c8a1ed---47005235577.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a419d853df1---45628840291.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/jm52gqq2s02n6grjf8bc91bs6r/6934293824.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/41976749479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ciencias+naturales+3+primaria+anaya+pieza+a+piezaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 18456 bytes
SHA-256: 2a59aecc99c0481548fd07d7ddd05f1f84a358c9d2bb8e8d95e452ebef0a6e1f
font_01_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 15408 bytes
SHA-256: 768e77343d9ef01aa5c60aa6a33226c384b5b8f0d2f9feab6cec1dead7cd62cf
font_03_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 10892 bytes
SHA-256: ce8e59b8e8df08580048943401d02647ee28315b6650ea24150bf0badc97a3f9

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