Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e48dc8d6f4e787…

MALICIOUS

PDF

90.1 KB Created: 2021-09-11 23:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d020feeb8e07b013ab8b1f41366d0c4f SHA-1: ef122e5f71fd126748c4059db524f21bb33d212c SHA-256: c3e48dc8d6f4e787b4b8f1921b2a078201671f9e2f8a776919cb06ad8b808731
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. One heuristic specifically identifies a callback phishing lure, indicating an attempt to trick the user into interacting further. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=gta+vice+city+remastered+android PDF link annotation
    • http://pincailight.com/zk/UploadFile/file/2021090918552073499.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b225cd40c9a4455455d5fd08b75f73a2/39008600141.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/39615696916.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/16220713117.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/4867568329.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/pudijinefopuzupizeto.pdfIn PDF document text
    • http://mp-journal.com/media/file/ligoxuzedupewarorop.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/xudegutebuziwekuwujemolir.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/26599398404.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9596949624.pdfIn PDF document text
    • https://apra.pl/files/file/newizojenozabaxa.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/38fea329bd3d5272d36478872ae8977f/66063395928.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/78313626771.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/xazakezunibomomalumewa.pdfIn PDF document text
    • https://curvy.tw/upload/files/nukukajetujorivoref.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/midabuninukojesuzubiz.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafa25dd87---zoburav.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/65cbc68b75941e59fcaa313c1b8a44b6/pexinowezamavevidanepu.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/108278691.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/gupaxa.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28110190262.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/mamazufupiweke.pdfIn PDF document text
    • http://koddous.com/userfiles/file/vuvofobez.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/50904521573.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134148d9cf26---11850844538.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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 16064 bytes
SHA-256: ee281417bccded177508b2485af8f1082c201dfbaa479ccb1ea0a8211cf856ac
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 17996 bytes
SHA-256: 298e12344aba31283608fe920256cc0410173b2fad76b12e83f0a20ed96fb3c1
font_02_sfnt_off00014260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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