Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efbb99495014e24…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 14:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c696f9883748d95809a82ac0a48a426 SHA-1: a77a67c05dee22f59560d03122662c167088baf4 SHA-256: 3efbb99495014e244ecc77d5b952d095b4d4c175364da1fb4ede4ab28cd81af6
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of 'utm_term' in one URL suggests a phishing or SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=forza+street+apk+download PDF link annotation
    • http://bhk-aindling.com/userfiles/files/dajib.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/zepudomim.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/fewimomizamaseb.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a391c0291e4f322239f64cd8037a8482/garigivekedavorukedi.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/97163034936.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/17776043032.pdfIn PDF document text
    • http://come2menorca.com/images/file/dejorabaxevufedawuv.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/63499288479.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/64543661775.pdfIn PDF document text
    • http://apcmagon.com/userfiles/voxuriwafikomoma.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/torafejutop.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319995a085a---45171216839.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109030148269266.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/73297624030.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a9e52ec82ca0b1793f0b81a44d5ca762/novigapob.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/sewegiguzamufadoni.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/bufadasir.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/58157720447.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/sarutaxiwubuzuranozepa.pdfIn PDF document text
    • http://medi-sen.com/files/files/xotuzodapinagav.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a6fdec21766feacd669ee16387bc9375/48479117196.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/doposejubaxemojemored.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_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 10508 bytes
SHA-256: a8e7997d9932ee89a56655a171d5a2d0559f647b88d9c86ab0e766a0e0894c30
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 17776 bytes
SHA-256: 8f5cf7868a8f4d3c9dfc5c106870708db7c46b2c1442e8f88954ff514f5d4d24