Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61bb8d2450240cd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 16:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba55be81625455569c8d11dcab9347d5 SHA-1: 76eece8f592e2ffe99d74830af44bece0d8ecabd SHA-256: a61bb8d2450240cd825ebb4158fd9263a3f2a32da0d01c1cf30d64aa0b4af75e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points to an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=galaxy+note+20+sd+card+slot PDF link annotation
    • http://ovstav.cz/app/webroot/files/files/xabuwedo.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/jivixerumoge.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///92609802667.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/77508067586.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/3282682842.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109051319311840.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/565a7692e4ca277e65051935b54576f3/47956471105.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///5981001802.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/31619070270.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/32692337433.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/sepobow.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/budixe.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/14/18583419338.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e339c3f0f---41295819924.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/tirazazilejiromog.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/dojakobuzipuwuxeluwijufa.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/92967087378.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/68345820841.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/bepolirezepatosalel.pdfIn PDF document text
    • http://charivne.info/images/file/26577093938.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624510b5c8---davonunanuje.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/56814352125.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/69916886427.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d6c3aedac8e5d7c1fc52a6d2382359c9/gixolinavagitijilawa.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/16511898720.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_off0000d558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD558 17968 bytes
SHA-256: 4c2762a160a6784915578e8be918e164b57d76485851de9e28497831d5c09245
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 10768 bytes
SHA-256: 11b91395998f5c71fbef607abef7454ffc69e0dc7d33b0ae099a31f5180d41cf
font_02_sfnt_off00011d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.