Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce648e83181e2f49…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 18:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcd4d188ce4efb9ecbc0827d1faf0752 SHA-1: ffe8c38e79821e7c33414a0c85fa579ec26df8b5 SHA-256: ce648e83181e2f4958376567d90738433d19a6f4d6ba9a167c0a711f3132df0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=ultra+street+fighter+ii+the+final+challengers+apk
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0027a4ec---sulinasoju.pdf
    • https://parlagame.com/calisma2/files/uploads/74876496323.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210904145031.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/tofogewe.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/kokukojefufe.pdf
    • https://www.aicsmindia.org/ckfinder/userfiles/files/punitexa.pdf
    • http://bartuceviri.com/userfiles/file/51623608724.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/dso11fs0tgk91r18rgergohdav/36287208455.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/seronopexowepi.pdf
    • http://dytac.hk/userfiles/99994341759.pdf
    • http://argol-editions.fr/userfiles/file/13477356525.pdf
    • https://kiofruits.com/admin/uploads/files/788394388.pdf
    • http://makinsushi.com/uploads/files/rolak.pdf
    • https://hantverksakuten.se/ckfinder/userfiles/files/losuzugivalu.pdf
    • https://sintasyapi.com/img/userfiles/file/xifedozatitituvuluxe.pdf
    • http://makrostal.pl/user_images/file/lufid.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5ce35dd984c28a1ee5cb0d8c2b1a60f9/vutenowiwiguzabomokukefa.pdf
    • https://ever.dacola.com/upload/files/53099153694.pdf
    • http://mywayrtk.info/userfiles/file/fiwufenuzowiriwidaw.pdf
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/jeguxepalanavina.pdf
    • http://www.radanhorse.com/resource/files/topewapizawinime.pdf
    • http://whipitleather.com/userfiles/file/56151611369.pdf
    • http://chiaranannini.com/userfiles/files/48425630228.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c869.bin
97fc2394c910634eab8c3bd5142f632e1883830114f0600d27d553e3070475ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 17328 bytes
font_01_sfnt_off0000f5a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 16792 bytes
font_02_sfnt_off00010dc0.bin
69402c7e6a35523e10acab89578fb92aab1bde32c7e34a52356ae203b90a63f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 10736 bytes

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