Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5071ab0973e769…

MALICIOUS

PDF

77.5 KB Created: 2021-06-19 23:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db5db09fac415b5f908c31a2a400adba SHA-1: d8697772beec453c01961c6d1fe0600f30de04a3 SHA-256: aa5071ab0973e76912afcf2380cfa0b6f02555a834c955b8b8bf637deeac6cd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://drafthe.ru/uplcv?utm_term=all+in+his+hands+charles+hayes
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bdd57454a---86375537629.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a88d3cb6a---zanuzumofonimibutuga.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4jtqfc9atcrv6ta12c1b1ter95/wadomubokiwokitowunudo.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d20a959de---bitojijiz.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/up8knut7i57340itmqjqibat54/61501447266.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aade07bccc---limukedopifubovata.pdf
    • http://mid-europe-ex.com/images/blog//file/bapelelidefafan.pdf
    • http://domplus.su/userfiles/files/sibajosewunewod.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160818fa22564b---nilebulovusidolut.pdf
    • http://menafundinfo.com/userfiles/file/nurizositegubirakil.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6bf00a2a---77652518837.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/716a1fa7ead3f7b894500d483fd87d51/garunimovaw.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160899b70985c4---zataluge.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74536a5fa9---39673464776.pdf
    • http://quickvideo.nl/userfiles/file/75780127805.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g5f0cdauhnpp37qhr2v1gh0cm9/65633864898.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25e.bin
441016cc57562c22f12d80e4ac91c5e39cb1e20e2427ee9d20498de199ee1009		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 5120 bytes
font_01_sfnt_off000103c7.bin
8e1c87764fd73c7239ff5788cdbe5eae8e40260d583339de862d819b5b185e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 11000 bytes

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