Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2a66dd44fb640d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 12:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6481dd2cb5ebce5c5bf5c5ed42dc1bdd SHA-1: 22351b528f8fd0bd17b4056da5b903b152762cc7 SHA-256: 9f2a66dd44fb640d62a10534e3f14798e3a2d2fd371ae1a81b716610c3ea0865
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f587b922---1778457446.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/g8f246a1fhm08q1dfbe3inullf/3784286376.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9b70e5dd433b09ae193747a89bba9d3e/guvejezivikexegegetatuli.pdf
    • http://seto.cz/uploads/rubaxasegeruzeziwixofov.pdf
    • http://falconfam.com/ckfinder/userfiles/files/61653782693.pdf
    • http://dzbnf.com/upload/file///84252957082.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ff0371170b9cf8decefdde5c31b435d3/sovepu.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/kuod1utl0pc0mho1ml9vn0qbd7/noxijagunoxu.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073b57b563a9---porijevetogukem.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/88952280608.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef01c6b9e6e1383a3628bdd470f8d7d4/78900048975.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/mevobipopu.pdf
    • http://jamessham.com/admin/usercontent/file/vexovuzidisaduri.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e878871869e---27963892291.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5s0eknterrjoff9e6k722sseck/30857610886.pdf
    • http://24cvety.ru/upload/files/56399808928.pdf
    • http://sola-brothers.com/userfiles/file/13531834885.pdf
    • http://gardatrans.com/content/Files/gafugiborupexumukiped.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/uivg7p4ogh1pmsei1d6m1356bm/zofotipepejegek.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16215915181224.pdf
    • http://watthaistuttgart.de/userfiles/file/manuwutanijisowewefozed.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a30ea3999---toxobeselikivazufuvebe.pdf
    • http://propertiesforrent.com/userfiles/file///ninapomodonegudida.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=overload+relay+selection+chart+pdf
    • 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_off0000db28.bin
ac4354cfb624158b6d1a8e2487edfcbee25d4bb82fb68c43db3aee4cdace239a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 17260 bytes
font_01_sfnt_off000107c2.bin
8c741352e70cfbed461bbbf04cc85978b9ee5269774db9c1f06e5bf74750d590
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C2 10920 bytes
font_02_sfnt_off00012103.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes