Malicious PDF — malware analysis report

Static analysis result for SHA-256 a259aadadcfbe552…

MALICIOUS

PDF

96.5 KB Created: 2021-08-11 17:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37777bfbba0e50ee5bd78ca2b5f2ba56 SHA-1: 0af66f074030afaadb03d04ac1a6fc023483447b SHA-256: a259aadadcfbe5522eebf25e963f0562c2ad8e2a387c5fa5c53817105cb0b65c
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to compromised websites and a deceptive download button, likely intended to trick users into downloading a second-stage payload. The file's structure and embedded links suggest it is part of a link farm designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://crewmak.ru/uplcv?utm_term=shankar+ias+environment+notes+pdf+2021 PDF link annotation
    • https://sasalidayanisma.org/uploads/file/11710625475.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210531161022.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/80937191414.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607738e8a32dd---lesaxojezivozejimere.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/zegivavebebozu.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vodarewipivabunelozas.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4m24i2g4fo5pc04p3jrmivk0l4/xuribofipiv.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/begarenogawufagijev.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/63189178407.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f8f484e4bbfba2fb7de5941007fbe7d7/ridus.pdfIn PDF document text
    • https://medtek.vn/storage/file/48312329624.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/cd89f36b27419110cdf79bfe6cf5b958/78408707641.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/72706480288.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/86846355532.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/8633527117.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608006e20c337---19323148634.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/036c8549bb9a71190894158008c004b4/35767763322.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/pujoxitubamekafonemiva.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/tifenodukujixumovagiva.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/bk81gm1nred8cm6kjpce881vhd/rareredazerulikokodaxajew.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/vakagozemulepijagat.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/57369362131.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fa9a3704d---tokasunifexekef.pdfIn PDF document text
    • http://video-cycling.de/files/file/64026489441.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/pufidaluvumezaxolejuxoz.pdfIn PDF document text
    • 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_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 17548 bytes
SHA-256: dd22d98c2f8f18b2c9b590a7f828f4c8d1dece8baa25c4ca5a15f9713b245c8f
font_01_sfnt_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F89 11244 bytes
SHA-256: 842b166c5ad99864fe392c66d3519c8a8b835e647d74ddc7d9e929324a94cb8e
font_03_sfnt_off000159c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C4 16712 bytes
SHA-256: 1e74026cffe3e6e9d8f345ecf4f7a93c01973497f80e46c99e63c9d10339ab84

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