Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a86e86bc687e2b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-04 01:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af3bcb1d0e9d1e2108a58eb1e5d24190 SHA-1: 0bd7f4c7124fa71a81f26d584f8975d83361aa91 SHA-256: 09a86e86bc687e2b918928faabf845fdb50f88f35be96ba927e8d7faca75cfdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://granitemountainranch.net/userimages/49812650234.pdf In PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/vobeketukixe.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/423bub5ajec2994t81r4b23da7/3678124504.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/tesosotowobuguvuta.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607673cfd5bb4---gixubexemixosetufur.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a869df53168---40569805907.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rs1m3fm0qvmhkl1poremi4ip1g/42851812515.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/07cc752383cfc7e3a913f43c87a9cc2c/rozewarowisaviwevumizaw.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/6717542243.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/digigegerosekupogobume.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f78ebda0a5---nogupaneredilukogufawep.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/21166879340.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/0m4b0a44rr8k4f5fd58r3v102i/pavetifedewisix.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021723544493207.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/jibukivuvop.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/79379244811.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ac837daf---14101160342.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/womemu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/53731553877.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/85f2fa68200ccacf84ba90c5f59ee16e/5730766730.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d10b8969d---12978401033.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/72292811721.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a83c191cd10d329f8dd18e01da459e65/45538446771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lebanon+visa+application+form+qatar+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_off0000c582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC582 17328 bytes
SHA-256: 87ab92df5f6592eec487c7f722ebb69fd78b5c5ff312c5b4af2f97b4765d3527
font_01_sfnt_off0000f1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 11092 bytes
SHA-256: 7a002db18a2e613d36dacd1ad6e72cd4d3e556016a869a1927a37761cd3606a5

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