Malicious PDF — malware analysis report

Static analysis result for SHA-256 9681e5c6e4de0f6d…

MALICIOUS

PDF

82.1 KB Created: 2021-08-24 22:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d58574c308f2d5a40a401a07db9a3d1 SHA-1: 4f3a5ed10946aef4a8d01996a5ae9557b6c54b84 SHA-256: 9681e5c6e4de0f6d4593383bad073ab9d4800198afc9751c328108df6500afb2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607befea1c878---48667649505.pdf In PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/timeliju.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/xisegofuzivagozego.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/25316320576.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5f84f6b44f581b1258bfb0ad11e98fab/60531208292.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4df50289f---golalowinobijefov.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/96978278274.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcfc9c711---vufuse.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/tisuganidazebonafaribu.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/81481596918.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1ac5f60840c431674bfb5897625ed49d/21968674235.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/wafetuberuruketirovijiwas.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/kavasoganumufupezeka.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/fubewowenikafikowuxo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/gutawogufelirejako.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/40962835817.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/33705584543.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bc59bfb9b---litexebawefugedegirefa.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/28506553175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=chihuahua+for+rehomingPDF 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_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 17488 bytes
SHA-256: 4b2222692f53d55d80ab811b666355d72d3f0b71017b599ea6ce242f0d6dbe20
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 10480 bytes
SHA-256: d43472ddcb60d45e480f3ba5ce9d66f60b792e35539c0c235aa7c98fde88383a