Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50dcd3e7411a731…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 05:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 58a7cb9c826b87384306efa078a55651 SHA-1: d7d46334e40d5b9bec6c1fe6993a46ce74530a0a SHA-256: d50dcd3e7411a731e4bb2d8465470de87bf07e9a7d6837a34fb9df498cdfea2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=add+fragment+to+activity+programmatically PDF link annotation
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/tefudikexukuxiro.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/57313481615.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/37621778860.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/midalaxakazivowukilo.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/41259394556.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b64398dcc1---jedapo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140edab96a91---95346098398.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/eac8454130dbe52b16f72c337fabbce9/dogazifigudirobepuvu.pdfIn PDF document text
    • https://jin-ji.com/upload/files/57938661787.pdfIn PDF document text
    • https://clubon.top/uploads/files/juviwa.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/75598521396.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/82500675464.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/jivewajezijefiseza.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xowuvabosagavowil.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133868a01fa5---26836514544.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131232a28982---92886164186.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/49682110906.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/zijizavejufefakazurew.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/trd6l0npkff0cijf2ibukfot9f/bijozazijafanu.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/jexilominuzazalew.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/gataluxapowavowoxuraji.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/86222784909.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_off0000beba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 10956 bytes
SHA-256: c4a3b3f4e0448c9bbad6f8dcff4941e94b197acb14443589d2885dab644e208f
font_02_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 17160 bytes
SHA-256: a3600c57774f50ea318c36d6f24585d36ad15a8000d398e64192c0dc65f5912d

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