Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bf695c21592868…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 00:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46fd791324ecded93c2d1d532bf761c2 SHA-1: 9b544b6b26b33ad546c75ebe1f7a2de77dcdb509 SHA-256: f3bf695c21592868b995804051de0e3c690b4b5bfd664a44c4f50afc44977abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The PDF structure and embedded content suggest it's designed to redirect users to malicious sites, likely as a first stage for further compromise.

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://vet-arrighicolangelicristilli.eu/userfiles/files/guvogikuxigedomujikifile.pdf In PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/goromanerit.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/95472316613.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137f3343c605---53111778398.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/tojibukumixasudoratide.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/nimefevonanosufuwaxug.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/e1kukgd46qkrf3bej5t0hkmdt0/komekikofalamikik.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///52818345449.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/43988591786.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/85f13f2450092b9c7d66c42453781ce1/54046413595.pdfIn PDF document text
    • https://basisangka.com/contents/files/19138451449.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/59387220658.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/28418872893.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/woduxuvawarunibatakaze.pdfIn PDF document text
    • http://ping-property.com/user_img/files/fifinojawumopopabafosusow.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf328bc29---lebokugatokanipuv.pdfIn PDF document text
    • http://eventechsite.com/files/files/64840719462.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/nekuvadibop.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/mabebujusat.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/82355658810.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/60833592980.pdfIn PDF document text
    • http://mamitobe.ru/files/file/83926637571.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/tizakolikez.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/wavexudawoxelatovajaf.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/17138569931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+auto+compatible+appPDF 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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 10728 bytes
SHA-256: eb3f2c9731d9255a63ac79f2d5f370ee17cc6a467d2cdb3dc3992fcf4aeab520
font_02_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 16976 bytes
SHA-256: 491dd8b4f1f7005c361fadf3f0d5907fd4e0b2be5cdbfb9b5516917819cbad9e

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