Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3320fe00212f899…

MALICIOUS

PDF

67.9 KB Created: 2021-09-09 08:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46e503dc36f26e85dd0be9061ccf2ae2 SHA-1: e492b4834a2ac6afd63e70a996cabce45c68188c SHA-256: a3320fe00212f8995a5e6dc49745adb45ec7724f9f912ced3ab64df4f843ac8e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.thaiahpa.com/flash/files/27718545097.pdf In PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/84034732699.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/tawowisaxuwibiku.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/53341388279.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/772c6e8ca3b1081b0240907e47a0ba4d/94734867749.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/nitizavov.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/rubebodovuxiratonama.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/8965790140.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/kovigopugivovezokejuvemem.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/80145981195.pdfIn PDF document text
    • http://inercial.es/uploads/files/voziwifexapup.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/xumamar.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa8a2935e---senemefiketewutezedit.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/wevelafuxoxibirof.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/51b1db45b1f92dc321ae763d302fc4c5/pejupu.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/86800195496.pdfIn PDF document text
    • https://coil.hk/upload/files/wurekesikel.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/setatobixofujemuxitunawus.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/parerovemamebisaduronu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wexizifimiboxapug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=anti+spy+professional+apkPDF 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_off0000aaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF3 10540 bytes
SHA-256: 68972af77e4312e8933b0e3fcd40ddafaabcee802dd4e594dcfbf4c4e4840f6f
font_01_sfnt_off0000c32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 15128 bytes
SHA-256: e510db024a277e4df8cb6707255e8be42de73823e7d4f5f5b876da16e3947e3c
font_02_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1