Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e059f328854d20…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 12:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bfa1bc80b4f2ceb0dd989c6ac4b81e36 SHA-1: 6eb8199e3affa11de31cd5ef08df39f07c040c58 SHA-256: b1e059f328854d2078896f94d5ce3b119c6ed74e77981a3975fcd4bff522ee55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of external URI heuristics and link farm indicators strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=markandeya+purana+pdf PDF link annotation
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/e649b51f489f015b0c7c4689f447a079/boxejijisenemoxukilomud.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae3162abe---971538339.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/d63f57aa151b633381095ec1252fedc5.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/697bc58442751f8169acca1683e14806/5502159616.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c524d527945---finafezojumobagupufon.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829bc9d502b---22667743834.pdfIn PDF document text
    • http://bamor.org/userfiles/file/sitifubisajilub.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/10788002256.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/kidorig.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uu80eojr90qmnmo823c2a3d647/70498227287.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/xajedegetajuxutefaz.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/witobezoroketewevutugoruw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089bee325a55---72739577157.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/8039468274.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/regaseme.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/bufazesaxa.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/kigisipugapasu.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/narigivunogu.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/kuruxekogedodoso.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 10264 bytes
SHA-256: c126fe30b5fe0169f313622e0e23ad6f38bcf51ad2818789b599b5de486fbf16
font_01_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11494 17696 bytes
SHA-256: ac851bc4e2b4954c0b2f73747470889b0becb54c908f142faef484c9093767ab