Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fabda2860b734e6…

MALICIOUS

PDF

87.6 KB Created: 2021-07-16 20:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca4bbb7edde770dc76be5139a1d3a28f SHA-1: f41712d072e18f8bda39a41d54cb3cd19ee536a2 SHA-256: 3fabda2860b734e677ba09cd5abf6aed28f2d53dfa20ba74868f90e49cd185b9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b784724491---zojuzejusepepelufulal.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf06da2c04---lezemutazoludegewa.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/837c0b0fd5e4bafab99cb6d35f92be1f/42097958037.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/q9v4o35s87qamqaoi6htgr6ask/97993338555.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/zesofugovidimaninutumek.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/kixisubupurowe.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cce1c7d9695---44054211333.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f95b9d1---4411597722.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4ed33530e5876c8d7136269df1915676/51312452102.pdfIn PDF document text
    • https://ovalpolycoats.com/media/xetiwowezoxapenasegam.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/dadimutumomuvowuso.pdfIn PDF document text
    • https://peterdegendt.be/file/20853615371.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c4c49839eb8afcd979d05c199b4a2ea1/50217447686.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/urs8ue0shna0ah6tkgv0gj91f7/bukofosawonusodi.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/10ee42ac8db69be08754077c43c3526d/35590974076.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/8vo4pv64v7u4r4jhj5jd6670ea/jifojexezolila.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/lekamesuwitogolidojatifo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/ginelerufimunofizip.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c3672236aa38323820c288e86eab8048/vafajig.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f25fe479c290485d3de1e871302902ad/vavunititorepulubawib.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/22ce0589ad144e887ba470fb1cb5e2e1/vesunodezovenexatat.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/aa89c0d0e39d5614bb29d84134f616a3/95098620287.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/venuwosifozefoma.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d310be30---29481784895.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/51155421751.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/9bc9161bec893d881bde8ea4f26d08d6/gobatomigixozosowubosikob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=feeling+extremely+tiredPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 10336 bytes
SHA-256: f7eeb9980ec7c525ac10315a630597e3d9b2a0a385d2467a3a09e490db5779fa
font_01_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 16860 bytes
SHA-256: 6b918480f15d425f7df396a399e1fd4f9ad4e4bebbecdd9ec3199f0dfd0a8c7c
font_02_sfnt_off000137b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1