Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa30739adf044ee5…

MALICIOUS

PDF

83.0 KB Created: 2021-06-13 14:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c88551896f783de1c10f570824d7b5d5 SHA-1: ccc7d7d6d4fd875d00cce355127a37e6dc0658cb SHA-256: aa30739adf044ee5f89eda348ffd7f3b234084e0aa804108a7961a0906c94b8b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and link farms on potentially compromised or disposable hosting suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and associated URLs point towards a common tactic of luring users to download further malicious content.

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://smidgel.ru/uplcv?utm_term=shree+suktam+pdf+in+gujarati+download
    • http://leebyunghun.kr/new/upload/board/files/97237214707.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba5babdaa---65120590108.pdf
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/gidovoku.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18fa85df09---xagijejasijebili.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/pqua39bsk9j4p0ptbdb147vlq5/93332186255.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e14e2703e1564b7ee7712cb5771eb70d/zebajatapegogonovafilubuz.pdf
    • https://windsbs.biz/files/file/somirufizo.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4c1885f5---sojifogoxa.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a4e6da0de1cd1db5d5908d672c77237b/55683827917.pdf
    • http://assistance.uz/images/shared/file/baviwetoxikedepigox.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adec64d09a8---kusoperewibugenib.pdf
    • http://learnersdigest.org/userfiles/file/kixekifujid.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rgkuoiucgrmtod9prmh1l59e2k/fevujupulev.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735f8970a23---nujajebajatiji.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160902841001ac---24367796583.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3790454b38---zikalanawetazujumoguvumax.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2c583b625c701a6a2c2ba864146225b1/jagoxivuxufogifesife.pdf
    • http://longvu.vn/Images_upload/files/26712928840.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f957.bin
1ec97f6ee62ade5875d46ef1d40ff5278563c928cd8ac58903a634305879ebe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 5672 bytes
font_01_sfnt_off00010c89.bin
299335d2477752dbe92b7cfe1f8c8ad936876f80e327649d2cf3d2b22363702e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 10476 bytes
font_02_sfnt_off00012ef0.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 4324 bytes