Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9c21d47dae1f6a…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 14:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f13389eae7be8612faea1ef652066c47 SHA-1: 2a4eaf0f445f52760e5ee29ed64cd6c5a5157f60 SHA-256: ac9c21d47dae1f6ad5cc198666adefddd05a0c9f8ffe7496dd0c7032bbd4ded9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/n9cr7lo39tlt84a5657tg7thon/jotukipoma.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/13666a6bb6e79c8d0c9be2a872d703c9/gutowawi.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/8495406465187384def220b2caab0cb4/pujomafirosimik.pdf
    • http://lamdecal.com/Images_upload/files/fezudixavebifotat.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/831826d810791e1e1fea3ee021084cd5/jironelanaf.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bp6k3et32c3fcc0qheelbuqvs4/56874941539.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c4a0b1f5---56055061171.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/62f39b7d18c581a48f357d7d35f1200e/71319222310.pdf
    • https://zlatartopalovic.rs//files/gekusi.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870301626d1---vozuzojemi.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/34635805660d2a3d594b27.pdf
    • http://ttccid.com/userfiles/file/44945095687.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lipue0bimvdbl6ef6lk6bu3m52/jukoveviwowapaw.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabe635dd8---vawumeravekafetezuvonez.pdf
    • http://aisef.org/uploads/userfiles/file/file/15391834700.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5f60f95b94dd0fa0fefbe908fc65c1d7/nevunafuji.pdf
    • http://poorclarescork.ie/images/6171246602.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6981ec51---8384719053.pdf
    • http://asbu.net/uploads/FCK_files/file/70628934092.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c32f5fea8607ddf145a3bc8e6c10b07/86032413547.pdf
    • http://hzjksj.com/images/upload/File/vodatupaner.pdf
    • http://pphu-joanna.pl/fckpliki/file/zelowurokakobijadige.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7d0a0c3eeb55bbf86e761db1d8e7e4b8/witafagilavinifasa.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b65df744c7---88663499885.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=class+11+history+chapter+1+extra+questions+and+answers
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6bf.bin
adac179d758f6063a0c0085365a2715817a1374e9d08c125e88a5f152b463e16
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 11244 bytes
font_01_sfnt_off00011104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 16792 bytes
font_02_sfnt_off00012916.bin
4114010670ece8466818e82fc32f819c774fa9986d8594d16b0914736150bf06
pdf-font-stream PDF embedded font (sfnt) at offset 0x12916 17324 bytes