Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f048eeead4150f…

MALICIOUS

PDF

79.8 KB Created: 2021-10-18 19:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb4dc0623ae357354baa94f2c4468b26 SHA-1: f3a465357fba4f357b077c61d68da2c538d584e1 SHA-256: a9f048eeead4150fd396cde7014914c171eb3adcd3048763ff6bc7cb09914d47
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with several URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of invoice and callback lures further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bandotrading.com/uploads/file/6011025115.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16e1e38b8---fexegobelidajirivizapuk.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/15086930581.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/5586821885.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/tanowu.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/fezetobobemowemuzixi.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/tovuwidaxupanolavukufor.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158946854416---jonufitepasedar.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/42931892855.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/84819376096.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u12b7qujihmd6u4qfkr2mfe6dt/24030556941.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/4670672218.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/81034256074.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/7030988835.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/1190603961.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/fusatufokaxudujeliwosu.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/61027321632.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/wuvirekajolaninukegosip.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/derolabuwijosor.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/witirupapisaruwubege.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300bc8f4047---4400753462.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=deposited+check+not+showing+up+in+accountPDF 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_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 18888 bytes
SHA-256: 14f84253547f70236b2a7ac7f8f947c08dad235a7ec40b219a36f1e43e54eb08
font_01_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 10928 bytes
SHA-256: 6ac46b584b03c42676a05d317ff8ad01e0f6bd11003577687ee8caa1a964cceb

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