Malicious PDF — malware analysis report

Static analysis result for SHA-256 6652e5d141b4f094…

MALICIOUS

PDF

78.6 KB Created: 2021-06-14 19:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b25621723b0c99e4b64da96ef2df9f4 SHA-1: fe8ef37fd4e01577476ef2eb89ae45cfbcb20e56 SHA-256: 6652e5d141b4f094b448a9ca30895611fa29ac87c10e000dfcc073635d52a8ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body's garbled text and the presence of external URIs further support this assessment.

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://archism.ru/uplcv?utm_term=beautiful+telugu+movie+watch+online
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/77782d947a0ff95dabd42038a6386ce8/84533980147.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608de916c2a02---75579317599.pdf
    • https://psychologgia.pl/Upload/file/99393271624.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/5b28f1c656f9b8d3133bb12f31de59c3/tetofogojiburivapak.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/fa31670c05dab594dc8e3ad23eb8b7d8/11564904070.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/e372eb33327f62bc909cb6410649cef6/28586818342.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/53549900880e3ae52bae84f6399802ad/87842215930.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09e7c42d6---rujibopozaxakibejuve.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/caf2d639db5f28ee619ed56c6e25084a/pitelurusevil.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/170il1k8cnp97p30nmmlk5c3h2/bimukaj.pdf
    • http://moyamoya.center/images/hand_uploaded/files/nilexamuzedelokamuzug.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/3007a660c28665fa808c9c19ca7d0097/73884060508.pdf
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/todudazav.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/864b10cf31991a177044caca774dbe54/sezoki.pdf
    • https://cplastik.cz/data/cms/file/6757748491.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e4339bab---84953506664.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_off0000f689.bin
6a8d0914f919d537ec22ca39dfe8f40d3a02e7114e4320c2a0f0ac1d7e648cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 5220 bytes
font_01_sfnt_off0001084b.bin
6d08f634e4225c23071a74ac0199a12a5a34bc4c58133d306355a2d40c38b340		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 10932 bytes

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