Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadad249fc48073a…

MALICIOUS

PDF

77.5 KB Created: 2021-06-10 04:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8bbe9e38e74a8ca7af2f02888a330b38 SHA-1: b0a016306214741bebcccd9c320636b3ef21f092 SHA-256: aadad249fc48073a6e59b076d21961d2b8cbb7440df6c5de3656a1cf2abc4b6f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with deceptive search result lures. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ketchas.ru/uplcv?utm_term=five+nights+at+freddy%2527s+free+mac PDF link annotation
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f2225dc4---repitolulopibuse.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbc4dedfe---batozukeseso.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a555c6ef747---37551268671.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/r8p7j9tram5nbfvquu068pkqqb/96999931531.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/197ca80edc5d9dc6701ab43016591f43/51941710539.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/40b2d3f1e549fa1caa8703de5037783b/jazamon.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715c94efca5---novopo.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210531_033340.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e569c1252cff9f31b58de79f1b8bc408/72186297650.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77309ee8c---70521596924.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f8eb47a41---17042883739.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/gisewuzunekuxawibiku.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ac76a7684dd9759da3596e05fe58d6a5/47271965382.pdfIn PDF document text
    • http://dgjst.com/upfile/file/44973358114.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd9306c369---kisepejumume.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/zivizivugeredivozaju.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/nkjj7qn4dgrodbisahdpnqt3a1/mexinusajeset.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 5556 bytes
SHA-256: 34275f45c9567d12d8c0db6e77921d57322f1e56d76590e68d4d5677ee25cf5c
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 10788 bytes
SHA-256: 72dc5759c016c4207f887de35bbb1135370cc47107a7146b3052d420105efb38