Malicious PDF — malware analysis report

Static analysis result for SHA-256 beaca037744c23df…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 18:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e4462d1ad6cb71e36f8ad365edc2f3b SHA-1: 1a616cb25410ba273f1a982c27e3cd295b57cb47 SHA-256: beaca037744c23dfe98d9f79da90b4bd36202d5c31ae70b216999a72961e1163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://archism.ru/uplcv?utm_term=ppsspp+gta+iso+file+download
    • http://dezmaster.com/userfiles/file/64360860601.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/tenejagoduzogonu.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b365a378e---tiwakerune.pdf
    • https://imihwa.com/uploads/image/20210919/files/20210919083105.pdf
    • https://deshpanday.com/ckfinder/userfiles/files/43988270544.pdf
    • https://ispartaprefabrik.com/ckfinder/upload/files/dovebijamubon.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3d4957863097ee16ea59959ca46175ca/rifupawukazokefewozonoj.pdf
    • http://champaigncursillo.com/userfiles/file/59982773592.pdf
    • http://libron.pl/fckupload/assets/file/josopiluwelonufakexexax.pdf
    • https://amgaa.org/temp/files/16516670492.pdf
    • http://remont-etalon.ru/upload/files/govaxaziluvi.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b7d12a13---86164837004.pdf
    • http://krajinar.cz/soubory/files/nukijud.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/welitukatasebizolupisa.pdf
    • http://geologicatoscana.eu/userfiles/files/nikudutagopegitifemowakif.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/s82vd0ns6bic779imer42uqfmj/nemalav.pdf
    • https://www.solucionaesp.com/ckfinder/userfiles/files/wigiwadekekuxejixodimegep.pdf
    • http://land89.com/ckupload/files/wenomewuxituxifadixa.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_off0000ad3a.bin
939124d0b9318601e0ac3eeb363e5740bd52a8c0a1785cb088543fcec7ca8605		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3A 15040 bytes
font_01_sfnt_off0000d3a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 16792 bytes
font_02_sfnt_off0000ebbf.bin
a56800f56e791a585a4892ae250260233c847cca183f14bf0360aa8fe6cb983c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 10660 bytes

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