Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4bf44e668dbcac4…

MALICIOUS

PDF

137.4 KB Created: 2021-07-28 06:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85afc47b6735138a4ce0de6fc9757504 SHA-1: 97d7e3f152b001654372d4e9b36d7b2fce96be3a SHA-256: c4bf44e668dbcac4e75d031747aeabbc6713c63550fdde4a7e7952e2b2507e5b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for phishing or further payload delivery. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d476031f---47601959017.pdf In PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e222ebcc4d---46419675711.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/l1v1usbbd0bs6sjbcqjsd7gs7s/miniwitivav.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/musodi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160828612612ba---74652859697.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/podafubevi.pdfIn PDF document text
    • http://alltechsro.cz/files/tusevijine.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f14a407fa1da23a44d8d307f14305eb5/15696303627.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/jurerotetokulidatugegada.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/pogogeginezex.pdfIn PDF document text
    • https://teamcode.net/upload/files/gireb.pdfIn PDF document text
    • https://luminex.pl/upload/file/ruwokeviruwewazugavan.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/13706545209.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/e2e75f0555c01f6c789878ed2e3a6ccd/guzarozozexagebiwedikolim.pdfIn PDF document text
    • https://digireg.pl/upload/womiresiteli.pdfIn PDF document text
    • http://saydersan.com/firma/files/gekelu.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a8b407d581f9a39332f91bb46989a5c8/90497153812.pdfIn PDF document text
    • https://adikkedua.com/contents//files/mukalidunasuwiz.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869c6530f33---nezonevedawuson.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b7efb5cd86e476639014ef222785d483/79210748378.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12a7ec7e1c---ferelirivaxezowifif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=arthur+becomes+king+of+britainPDF 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_off0001b5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5A7 11048 bytes
SHA-256: 1adc45dc4c78235cfbdc801198e62111aea3359fd8d662231aa7d23fba371713
font_01_sfnt_off0001cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E760 19936 bytes
SHA-256: 525fe75e759f12ff4653201fa62691fe2d55cae03515654be99a76559017b1ab

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