Malicious PDF — malware analysis report

Static analysis result for SHA-256 7985a60351731742…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 22:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6aa1f5390d730e617b4d1a5c4556d90f SHA-1: 5d799ab829cf20f4e496de018dfeba8cb086feb4 SHA-256: 7985a603517317422d2962efe64834ac192098f49665404abc2a452a58021977
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zisasaxewijupo.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751c3b4604c---kiguloze.pdf
    • https://festival.bg/fckeditorfiles/file/pekivotodomuli.pdf
    • https://666666.vn/upload/fck/file/63647906336.pdf
    • http://akkoryazilim.com/userfiles/file/24214859283.pdf
    • https://invest.pl/userfiles/file/36107451917.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78541271096.pdf
    • https://seitonsolutions.com/ci/files/85870745478.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609765133061b---75998986665.pdf
    • http://trendymamy.pl/userfiles/file/fefozukutav.pdf
    • http://crosswaysrecruitment.com/userfiles/file/22922134334.pdf
    • http://bkht.vn/userfiles/file/fagazizogofobowavuwaxaf.pdf
    • http://babamoleskine.com/files/file/gosejagekul.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1d4c47426c3c88a5d17cfa8d5e3946ff/zilirokosu.pdf
    • http://oaklandscreche.ie/userfiles/files/dixuregefela.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/94924504221.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5f056f86d---88005767200.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6vdjk7cp059sac49u4hh94ml9s/vonesepo.pdf
    • http://maasmartcity.com/userfiles/file/38367940771.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/mcf0vtvhons0p8h6l1b2kol4rp/78686485401.pdf
    • http://gift-founder.com/archive/upload/files/wunubuzuzefojoga.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/bewovomufami.pdf
    • https://telenovella-bg.com/files/kubusitajebiruguxepu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=brick+and+mortar+funnels
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 16792 bytes
font_01_sfnt_off000101da.bin
9d8d0115f77469ae08fed692ce81a918b680555649fd810a4ac226e73d69c8b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 17316 bytes
font_02_sfnt_off00012ee5.bin
66992d362324754d667fa0cb9fd03a1df1e0226cf9ad0d3a7be202a42ce57568
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE5 10884 bytes