Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41fe5a95023402c…

MALICIOUS

PDF

115.2 KB Created: 2021-07-30 09:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef70826b13eda3bd25060cca747eeb91 SHA-1: 7f371f56a3b520314dc209111a7c189e68cc80e1 SHA-256: a41fe5a95023402c308ca5ca4945b8ca42f2815b16923a4093243fd10d2e4a18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. The embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • 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 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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097faff25ec6---18802619033.pdf In PDF document text
    • https://lienlacanien.com/img_pages/file/41468424839.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a039a4156---49908144320.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/toxifapopileramasuteb.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/mesesilowo.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/bitotafalosopet.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/93233233047.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/64980933817.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1dc88d3ae88eed9b87699577b111b527/fefabokafaxuvewegevul.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947cba5c6bc---36530447489.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b56e0b2c3---nepexezosa.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/jemutafufibur.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610329f3c4b37---livoruluduvib.pdfIn PDF document text
    • http://www.dafnimimarlik.com/ckfinder/userfiles/files/75136289874.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d878001cb5---bibiperurolabaxujulakazus.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/jokagetapamerevomezukop.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/80900273259.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/68854169100.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cf981e053---32017602775.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/dalalanavumamijofalisid.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/vejifupaz.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/tesabavameruduwotunil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=arap%C3%A7a+bina+%C5%9Femas%C4%B1+pdf+indirPDF 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
stream_004_off000144fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x144FC 25380 bytes
SHA-256: feb1e95b7c923babf3492cdc64353e4e3c796143cc4dd34eea309686ed15d469
font_00_sfnt_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001724a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1724A 11000 bytes
SHA-256: d9c5571247b43daf19a37537b35cc4b78dd25d8a454602c71428bddba07f4fb0
font_03_sfnt_off00018aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AEC 20792 bytes
SHA-256: d351cc62b3022cf3adaefa972c3e53597097d87db723e434992ae9716514f72a

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