Malicious PDF — malware analysis report

Static analysis result for SHA-256 b758ac8c7fe32385…

MALICIOUS

PDF

82.9 KB Created: 2021-07-09 00:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 016f563fc2976573b4507cf98386508f SHA-1: e979b7a39ecef2661fe1491b8f7914dd0009e1c6 SHA-256: b758ac8c7fe3238504d5efc521aaca10bcac692f342df5ff5bd75795a5776ac4
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. The 'SE_CLICKFIX' heuristic indicates a social engineering attack that instructs the user to execute a command, likely to download and run a second-stage payload. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm used for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//28388498780.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/vimenefopopatisasigusipi.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d3f3a31bea7be683920d51e44b3da244/jafivekibozidafepowo.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/276223be40c6104b5bbcbde80eb59563/92850493707.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/9krjkn9j5saflukoas2qfdh9dh/10802103828.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7fbb66077366217a6331430cc6145507/6560778219.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/538df65106fca2ebd0c5e3f9e5210f98/rikobulupitag.pdf
    • http://moyamoya.center/images/hand_uploaded/files/bofejomudumupa.pdf
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/tajojo.pdf
    • https://coluer.ir/documents/file/tonudowarokafamosuki.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/a1185e87f0f647d87e2b33ad72791c2e/73976520510.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1e351f0add14031e75cf12e4ac881d2a/nexonexofizefoma.pdf
    • http://strandedtattoo.net/file/10838720017.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e05206828---jadunujojinifepos.pdf
    • https://petala.gr/userfiles/file/34750945162.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/48056f7c05ce08078e9d4885f5d320de/88939935126.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6f38d9196d6d8a9111b9156ca6d0a4f0/94301870421.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/9d4949d323ff20bbf65fb5e5666b11e1/11570459667.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13d8608782---19534452460.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd35e4a90f---veduv.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad3dab0c3---nadomugufewopalokudode.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6a2281a32---ruvakedix.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2daebe6e---mexilumo.pdf
    • https://b2cexpressdemo.com/userfiles/file/zukafekasas.pdf
    • http://allaboutdowney.com/userimages/60780124044.pdf
    • https://trips-in.com/ckupload/files/titegopasowewevasevix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=5+voices+free+assessment
    • 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_off0000e125.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 16792 bytes
font_01_sfnt_off0000f93c.bin
6816191a6e1c53b217d07f54cc3aa4d0e53150a6c76b13f4fc45b439fd495f12
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 10552 bytes
font_02_sfnt_off00011152.bin
6120323065cb7c3f9397ff885dda741474d5b90f85a8d7c4f4bb52880f3d9064
pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 16744 bytes