Malicious PDF — malware analysis report

Static analysis result for SHA-256 642bec107b3a635c…

MALICIOUS

PDF

91.7 KB Created: 2021-08-16 20:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c46c469a2cc5c68e20cf78da83f74b9c SHA-1: fc7e40132198d09481051590d727fd2022b34cba SHA-256: 642bec107b3a635c6e56004bd7510331ebbae0f4ff72e90bd2f85fc8dcaea02a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://confetti-seasons.ru/upload/files/97717904142.pdf In PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/68613879350.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad09794a7da---36661216482.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9590fa4baa---15173347066.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/kilagedopilisolixu.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/9603910758.pdfIn PDF document text
    • https://kuepancong.com/contents//files/pemeramivemajemupajan.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/12440627776.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/86683041177.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210520051036.pdfIn PDF document text
    • http://nothingelsematters.net/pharma/images/files/sarozuxafuk.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/nibabuwamiz.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607720ab4026d---90366500086.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/gujaxexazafudow.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/95871096007.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081513d26101---kesajevutujebewuladizut.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/57573702182.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a271a5b5ee---seraribonakidiku.pdfIn PDF document text
    • https://susta.vn/userfiles/file/42318997781.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/64930562350.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4aa54b41---76624533918.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdd74c405---9696939561.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/sediz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=partes+de+un+molino+de+cafe+manualPDF 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_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 10736 bytes
SHA-256: 8adecb1ef4c0c9217f42323a45a5229352d232552ad6b72cb521542d84af4994
font_01_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 18292 bytes
SHA-256: 23983f70f3be9dec53bd57b4806193d20c362e017fef844c75f154377ba4cf57