Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f39027952819cea…

MALICIOUS

PDF

97.4 KB Created: 2021-08-23 17:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bcf36eabd01c5244c7d37336ae4d02b2 SHA-1: d32f08304a35e95b2d0ded7b4b0843109ef54ede SHA-256: 0f39027952819cea5ae35e2ff3c8f9733b453c4b67d167b4de18c5d644672f19
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://proia.bg/userfiles/file/74940864953.pdf In PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44c49b0888---1059322114.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/52874691427.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/falug.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ee068083---funifowive.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a826401393---selosivo.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/jiked.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/np7t8qdda7tprp1vaahhld4ra2/pebuv.pdfIn PDF document text
    • http://hasyo.net/files/file/gafetafilumode.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e489468fb79da0cf31384a885482a71c/musejoderasafeki.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/bokimumononetaxebilot.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc133f446---wobitodose.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/bufolagi.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/41870634366.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4532fb7fa2041d7b2be90fe5e422fb8e/45699416099.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/bixoritigimagot.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623326075.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fpqbhk9ce23un6v4l1ns9at9dr/4782920253.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/54655379224.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/97mp2bqu8b6kgusl2b0pvvn27j/82458971866.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/95609749805.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/8b998h8v2u56jrhq5pke6r0b19/lobogovofevisof.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/29321106999.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d77536b4---27929019977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=beginning+and+intermediate+algebra+5th+edition+pdf+download+freePDF 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_off00011689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 11192 bytes
SHA-256: b6a0e3f8894449ce6f91048b394bfad2c8d81833d01d303c1382e0cfd4653660
font_01_sfnt_off0001302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 17992 bytes
SHA-256: c71e9a7c34275c6fb689e7b53c61ab5a83d54cd449cc08fa82124117c694480e
font_02_sfnt_off00015ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1