Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4ff1da66a9ffa9…

MALICIOUS

PDF

77.8 KB Created: 2021-09-14 01:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddd17c86b4c712a20b5b9154cf938ce1 SHA-1: 8c9ec543dd4c12aa93da7a2cf5a9fc86d3faab12 SHA-256: 6e4ff1da66a9ffa9aa1918fde9c8a9a66e5902c24537bbfa43ee2f620c3a7457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://pixomot.ru/uplcv?utm_term=hex+to+char+converter PDF link annotation
    • http://auswallendorf.de/userfiles/file/gesavisoxumiwonokavoxu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161300278e28b0---daxijajedimitob.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/92257560535.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/wubebexisaxujebelogomawe.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/77106859813.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/71153029945.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631284364203ab869723a40f7e.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139b86442040---lerixeru.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/55256610301.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61379cec9108f.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/fexoniguva.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/62758165527.pdfIn PDF document text
    • http://khocabien.com/uploads/files/57556741818.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/55589402581.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/tasefafufo.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/79171804346.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/56960dd323252839ee7fed30e2cd4908/zukixekevatuwiwov.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0797831001630821807.pdfIn PDF document text
    • http://riwg.in/userfiles/file/84391080717.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210905045521.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/paganefapobal.pdfIn PDF document text
    • 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_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 17996 bytes
SHA-256: 04e53b9c772c12c463f2cb84b0d5bbe64616c494c52a3deb6338f3928897b9e4
font_02_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 10180 bytes
SHA-256: 886b968a8911bb4cfd614fdfb49944ece3e98abac9bf5004a66259d49dd7e29b