Malicious PDF — malware analysis report

Static analysis result for SHA-256 52875a176cc55f3c…

MALICIOUS

PDF

90.4 KB Created: 2021-06-11 13:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0357873aa8c6448e2b228e4dfe135afb SHA-1: 963f644b31665516ab7b21bc3bb72382fd0d2492 SHA-256: 52875a176cc55f3cea9339482a896897294c955b0dfbafc33f7eb4b12f198965
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/uplcv?utm_term=picsart+video+editor+apk PDF link annotation
    • http://supermarketdv.ru/files/file/35197179372.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c30ee8b1f---fakiwomurejefaxulirup.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r7qoeb30f95dm2d7c57qcgto77/46338562635.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7763628f60e0a8374c24727f11187ce8/49668393841.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/58220f51a1f2323f9ffc412932705051/76097393050.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/97941530862.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f7e6a853---xidunuvutiforegoxunir.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ejaeurrv7nps95lte17sv3puu6/42527425600.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89bb7e578---litipuxabumunedalatuk.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lqac8qh711o39sq0bsapfhohrs/6799890264.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/7544447543.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a8f1e826dfa527f086e7aad9f8c5b230/12162056385.pdfIn PDF document text
    • http://foodchemsino.com/d/files/53537567980.pdfIn PDF document text
    • https://artenika.pl/fck/file/18273873710.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089222d9134a---22994598913.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e164c7444e6e78cbfd4460de16e27c5c/lujatanoxonuke.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m9ma31ue8krh8ib8jivod4fujl/55210135253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 5160 bytes
SHA-256: 61581801264ceee57b199d79aa4b219e318298931da90dbdfada9b446f708036
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 2332 bytes
SHA-256: 3d01898e91c5734bd4bbac714ec895a8ca50b458a7ed865f8855ca94f7b0882f
font_02_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 11404 bytes
SHA-256: b506bc6dd0dfdb01c8ec86a9572b4bc9d28b129bfeb056c0a834b714985272f3
font_03_sfnt_off000144f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F8 16232 bytes
SHA-256: ac5d9198e9e5788e2012a92f79ae3d93b0172fa872ff4df9b6836d0aaa1540d8

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