Malicious PDF — malware analysis report

Static analysis result for SHA-256 556a8fdea1d4d9d8…

MALICIOUS

PDF

76.3 KB Created: 2021-08-22 13:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b90c4073fe8fe711591d1f2bc7002c76 SHA-1: 62f84e49ee8e71f008931157bb0ae1c9bc28c025 SHA-256: 556a8fdea1d4d9d83156485bb42750234b0e5cb6f5fd4c5e271ba5f6c5af83dd
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution scheme. The heuristics suggest it functions as a link farm on disposable hosting, likely to redirect users to malicious content.

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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/69222f2d95bae855189b19c16965e4cf/pupowem.pdf In PDF document text
    • http://autobedrijvenindex.nl/images/uploads/75390795309.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a152f55dcb7---21159418070.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbcb6d7e74---tokufutotoduvaza.pdfIn PDF document text
    • https://podimercrm.com/img/files/34223803260.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j8gsvk99j6ivpue250f5mmatqp/netowefele.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/zabojom.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/814ebddc8a6025cba75470dd04501946/wufewekekalufutalanewu.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/19961006366.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/nosunorofodoxepanawefofoz.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bcm88v9d8pkp7la2psuiud2ij6/govinekojalibinubenewiva.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/54939452757.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/92bdef05c134409ce4da5a3de6bd087f/98574270523.pdfIn PDF document text
    • https://amblamy.ee/upload/file/4674579325.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/mesamavadofum.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ktjattqffjvtfl5e4ss9qlod34/50232951798.pdfIn PDF document text
    • http://panteres.com/files/files/migokilogadizag.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210707021029.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090244e4f209---femuporujodawavokepafusof.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c919beb028a---vaxon.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc64927326---12934879433.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6d05f4b4646e67498158f8b0a98b4c45/75575070875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=benim+hocam+2021+tyt+co%C4%9Frafya+pdfPDF link annotation
    • 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_off0000c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 11364 bytes
SHA-256: 374863995adb1d8be4affc165676ae002964476e390e2d6af460b6fdac375483
font_01_sfnt_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF441 18264 bytes
SHA-256: 76b1f6c0aba4dc0e17aa82f39bed6c2dde48ac9aad4126a97d640cd49a6ecca8

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