Malicious PDF — malware analysis report

Static analysis result for SHA-256 83376aa06a9f1195…

MALICIOUS

PDF

83.6 KB Created: 2021-10-04 22:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b13155dccb6d9884b3091a5dc481b4b SHA-1: 87c23772f0bf357597d611454af5c82a751aa3a0 SHA-256: 83376aa06a9f11951dde8db8ef5bafb5685291b2aebe131a26d8b7ea86d24ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with documents used to distribute malware or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://philabc.ru/uplcv?utm_term=gta+vice+city+game+download+for+ppsspp PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615008ce0b13f---16322369508.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/niguvitifa.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/34313214761.pdfIn PDF document text
    • https://parc-hotel.info/file/2672832235.pdfIn PDF document text
    • http://gaudi.tw/upload/files/21343180394.pdfIn PDF document text
    • https://matratva.in/userfiles/file/61905542733.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161482a24e9488---94356916054.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0bdff0ceb---burabasexobivemepego.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/50515019649.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/34727190202.pdfIn PDF document text
    • http://kd-council.com/upfile/files/81160637910.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/47642578377.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/rimifetawab.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf7893960---zosojomenubukilerap.pdfIn PDF document text
    • https://larsonsvanservice.com/nbloom/fckuploads/file/sajefilorikupewegigun.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109130621563188.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/rinivemexi.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/58410761901.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/bexoburojeg.pdfIn PDF document text
    • https://unosms.us/userfiles/file/duwetijirimokotijugulitid.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c53730b3c---waped.pdfIn PDF document text
    • https://okazionche.com/files/17157840641.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In 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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 19480 bytes
SHA-256: 506bd6f18a755d6c58801b9ce5d55c0a9f853f53339e8b663b39d0079d9dc461
font_02_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 11268 bytes
SHA-256: 46a5ae55df84568d0ca28bdc805e9bf19f1b210baec9ba4bb4590478d6ea3907