Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9220d0261a3f6c…

MALICIOUS

PDF

194.5 KB Created: 2021-07-15 12:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 309a2093eab8b393ad7a2f6fb1523872 SHA-1: c74d7e811ae9da4559c2ecd6e963c3bca8b1e1c2 SHA-256: bb9220d0261a3f6c9c30c5d9c766c65d5552cd14758a0ff32b6d6a8c19b89a9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160833d0f9e75b---kajosewabamufama.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f6e8c36a7b79291c858a671cf265e093/84374016170.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/l43kp83chd1gi6glu7mjo0rlu5/jisadivawenisajipa.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/97874596390.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/68331317611.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/52u92ld7aiiivq30hgduc6qof4/40657072258.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a226ff9d9ec---susazixaxawerojowoko.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/52683109b720b917f21f6e8265430a3e/rejuwobejuwegi.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/46579371909.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080a04569025---vuparofumefaxonetoris.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/bb9772fe35a9f20720680613339223ed/gezeredolemuw.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/110146458834.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bfd52e11df4d1c839b5c55c97445597f/tojixejawatosapepomewaxen.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210522235335.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/kozudopozorexi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4fe0186df---nikimobumipukulojok.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201689858934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=synonyms+and+antonyms+with+bangla+meaning+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000285aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x285AA 17896 bytes
SHA-256: e3fb363a17cfb42c2cedd1add0049d91da1d9999d4a8c6e3fee9f2656008041f
font_01_sfnt_off0002b449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B449 16208 bytes
SHA-256: 1b794df04ed277b4f6fec21c68dfddfee7bf5ae39aed6771ff9722bb0b8e3d49
font_02_sfnt_off0002ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CA14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E22B 11260 bytes
SHA-256: 6abc9307f3e4d480528d112f462e22069fc640eb69e6010316d2c3c17b0ef1e1

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