Malicious PDF — malware analysis report

Static analysis result for SHA-256 571b0743bd2aabbb…

MALICIOUS

PDF

73.3 KB Created: 2021-07-01 13:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a7d79b7aa0fd9bbe36b4b3e64d60282 SHA-1: 7a2a31360ff147fea76bf99edf69e236a1682451 SHA-256: 571b0743bd2aabbbc8785fff85d89e89f2e52d23e24474311060099091f13637
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. These links likely serve to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e07f2a9b4---giwixik.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5218c5fde---zesomasusulifo.pdf
    • http://agiusfuneraldirectors.com/files/file/melalirasosaf.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf69284952c---winerexefodogowuse.pdf
    • https://burstallconrad.com/editor_files/file/50599818574.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/4pem18bdifrc32joi02o1hdj7o/67897724290.pdf
    • http://techscreening.com/userfiles/files/komadovoribewogivid.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bdab835728a3a6254bd94b2390cc2c7a/37675685222.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/5e9a4732dcbaf9e53ff71847da395a75/letuniwozakizeguwade.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d0a8c556---dugunobinonatozos.pdf
    • https://sanidom.pl/img/file/19300852572.pdf
    • http://ufnk.fr/app/webroot/files/file/29950206078.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c948edc4de0ace9a8218d4e10b2239c9/51672501308.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/7637270650.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b15249336ef27d946dfb985e4c8ab051/51529481494.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac366950d7---bakejawemevikatoza.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/33586782432.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a4a4cd4ad---95570204990.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092cd9810bc4---sinawusumumusuvojupaze.pdf
    • http://bitite.lv/media/txt/122/file/vozekuxamija.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dd9087515771c2ec3e4a53e2d61fb148/jolonokokirufukorovebizo.pdf
    • http://beiwendq.com/userfiles/file/77980151761.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7bd42bac15db2f536c4045fb67e1e45d/74411720499.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=difference+between+ulcerative+colitis+and+diverticulitis
    • 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_off0000bdd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD4 16792 bytes
font_01_sfnt_off0000d5eb.bin
baa8d5a8059f5a67a99955c08c9d8159b4d54b26bd3dc7a9311dae4699b85476
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 10860 bytes
font_02_sfnt_off0000ef33.bin
c6a86615a99b6a6037fd5cd6eef69609bcd14139454df5b4d65f538b24b5e123
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 15732 bytes