Malicious PDF — malware analysis report

Static analysis result for SHA-256 954624d215d193ad…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 17:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0049596ae065b0e9a279a4e4810eddea SHA-1: ec4a4ca963c46609a324cc6535cf6e7240e9410a SHA-256: 954624d215d193ad3c8eb3a3cf84b8db111e2bd1c049ee35999f844b8b7ada35
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The document body was unreadable, but the presence of numerous external links on compromised sites strongly indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f89c428bf2---lejusituditapexakutol.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255c77659f3---woduwitotipi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8b7b4a11c---69025514139.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/dkv89l14tql2kmp6n2s1u3v9pl/24375208142.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7b4157a26bd557e8f018d4606da4b43e/99359818388.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/99230418238.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084c354d1c98---vegavaviwizaweta.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/1253650647.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f44be5b6c2c---66378794670.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/rixixekotube.pdfIn PDF document text
    • http://valeneighbors.com/userimages/guziboxi.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/62859631920.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/rotogn8c7gt861m74qf7j8u992/12263233566.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7637dcd326e3a2902ae1d8245f46c66c/xapasonanajof.pdfIn PDF document text
    • https://computerzone.pk/file/voxan.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0043042d3---giwit.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mhqo5vin4mi8ojcgf93qoi5a14/godefepeg.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/kagelaturojugagebova.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78718b65b9---32128034264.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/j42iuk4ge2h3cimfpt04tmen24/sezopubupa.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/c13gt63qn0kt31ujdlme41vi7d/vekexolafenogimap.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/wolowopivumodeburozo.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/mamixu.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/38256921245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=torrent+sites+for+mac+gamesPDF 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_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 17676 bytes
SHA-256: 8bef861aa61bd03dee49f897b51bb21b3f39726df5aaba17bd412efe8020b06f
font_02_sfnt_off00013394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 10596 bytes
SHA-256: 8ca7a48cb000d87ebb929522d7417fe20e53c114810365822c2a5d9a70f31a09

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