Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f47f3f1bb646745…

MALICIOUS

PDF

89.2 KB Created: 2021-07-20 21:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c05045c7bd6b924d62c6af3c5967e32a SHA-1: 75f411d8ad4d7de84552320a7f432d3081095c7d SHA-256: 8f47f3f1bb6467456662357e5bc6e65744db26e1f345ec8ed47c5238e24c8246
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage lure or phishing campaign designed to lead victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c4008b103---gexarasogelurolewotinif.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qo5jss43r6irfcp5dlcb9kjeke/nidokezopesifa.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b331b9b56fe---73472758540.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160eda4b6647da---dazobipugozunux.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/94158528717.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf178ab661---68886322080.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a926d69fac7---bogiraxuxupazezenumuve.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0daca20000---93575319145.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/tq3ai9jbslkev5dg9hkufnnse0/33848707310.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/tiliravelilagovirugavum.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609545b7607e0---majilikusexodamaruzubasef.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9349056c35518dd78c8fec6e559bfe8b/bekifijufoxewekiponux.pdfIn PDF document text
    • http://globalaircrafttech.com/ckupload/files/posufo.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/34783270014.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/37bb435587acafe44421db41d038dd86/98377490692.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb859d3829---fuwepa.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8461_20210623181147.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/65150241409.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca4b2353656cb1665359a96f522887c3/ridebamakivipexoniro.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b1834954f84f4934f1665a24db37fbc2/vesivuzelofatabiji.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096f967e6ef6---nojogin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=song+of+myself+verse+52PDF 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_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10716 bytes
SHA-256: 1a1aef64cf4fd70b2a063b96af4241f1554180347c6b7ecb5bf771184d12161f
font_01_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 17524 bytes
SHA-256: 28d9519a353ab194be886678ef76da2af9583f0c482f010f9639248bb21aa286
font_02_sfnt_off00013fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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