Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6534f8c8e6e3dc…

MALICIOUS

PDF

86.9 KB Created: 2021-07-29 17:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3740b996528d9d158969f75eb9a6a984 SHA-1: 89c23d6c23bfd9d664975baddd12ed245764df3d SHA-256: cf6534f8c8e6e3dc8870502c54f1970639c768208a900fe8a6d4049a95ad2c94
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to URLs hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bpabv.nl/uploadfiles/file/gonuralexufogat.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pmnonm17aph2mnfaa9vclgdd86/68879781504.pdfIn PDF document text
    • http://imi.vc/upload/files/buriweve.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f549efc5198a7da92a676d4de3fea48d/48153423669.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/633i5gtlmp31lmucg1vpdd4gj1/bofiwetotusesaju.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/mozisa.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/139c422bf5562c9d8e43dad9174402c8/dakolawujetiwib.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/06467c0ca1fd2f9702ab09e0acd66c85/zovipamadolekepotefiloxej.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b42fc65d0---kipukilotozopetowiloriv.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12e266a2e---majeduzopuvi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/38d68f04a143ff4e8a33c522150db951/93659648848.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7860d0e5bc87570be56f7bcaa2512de8/16494065960.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/zixireligaj.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/18lu3mhmf76r5dvqibjs07en41/61107346605.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/87737007345.pdfIn PDF document text
    • http://aimic.com/userfiles/file/tijokefakuxokesajosavezo.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/8b13a8e6bebe4b5643a9598af5faf015/fulegage.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/febif.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb708ace6---kosugibap.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3c082c91edebfa3d1b3ba4ed289ff294/6227947878.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d6889891e04c3b8c8035f4756c59b2e6/weporidejamugikuvijotit.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/muromet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=why+capricorn+man+ignore+youPDF 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_off0000f17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 16940 bytes
SHA-256: bd068034f53a29030f6b0a63768f8162da2bd7b11b8e678e713f905740c0bb5d
font_02_sfnt_off00013576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13576 10716 bytes
SHA-256: 70947721394883621237227a980b3c26b02cf66623745ddd965037245783f7cd

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