Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae10e3a460cda503…

MALICIOUS

PDF

73.9 KB Created: 2021-07-01 20:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0885ddf50bbc1a9bc738099351a41b12 SHA-1: dc801a69254c4b26873485b3d54a2331696378e8 SHA-256: ae10e3a460cda503fbab1f5a4b6589e1d44e2b3b607e81926da01b10c03f53b7
196 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of 'cmd' in the document text further supports the execution of commands, likely to facilitate the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d1cef427---34088892077.pdf
    • https://lemanssrl.it/file/jexelogo.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6b7408b8---94374458980.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/41016555424.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/77335507874.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c043871eed3---61771340903.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c24cb7e8330---vipivisasisokanixamozuti.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d10b11beb---sitadavapafidafanu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0835d21b8623aec575c1ec624ef44103/vinate.pdf
    • http://greece-ex.com/images/blog//file/kobagaguxatufaf.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/okcmdhko21fikefdm2snv0forf/9044538568.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/qso5qp2iif6lojfesdk7v183c1/zegawaloninuriwipajitew.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/tfsdb9nn3ci7nv0lufuistrf07/vubuwabu.pdf
    • http://come2menorca.com/images/file/dozoregapanujetowaja.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c2b337fd1eb514c11cda881683748b30/kexojuvekoxotekagug.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/03e11919d688f7d148f1c7b3ef2a1f84/gonobeneru.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0be7581ef---jimijeva.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac5dae6e1a---nixefi.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/7fo51j3okkiv3c9ldtjhanamr7/bubidorupibosagof.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/b86b2207df553b043c49cfb7f2d67c0a/29771901547.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca8611832a---4032824767.pdf
    • http://pocatellocamp
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=west+branch+state+park+cabins
    • 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_off0000c2a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 16792 bytes
font_01_sfnt_off0000dab8.bin
cf4cf4de93ebb08615b59a70ee7c959533be1a4a96e96ab7aa6bfd7d51566d33
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 10528 bytes
font_02_sfnt_off0000f275.bin
3671a02612ad7a0de2b4452b57cdaa66d3d87e48be79bccf8a551d39ad4ab78c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 15664 bytes