Malicious PDF — malware analysis report

Static analysis result for SHA-256 205b2a33acebd3c1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 07:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3886cc8f8a5806c01ab23cb84c078ec SHA-1: 6b4a18554cd92f4ed8ce2b8731b47d659098076d SHA-256: 205b2a33acebd3c1b118d25a2a32a8a4c9d4660823e2377bd78364e21f8d99be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=leggere+pdf+con+android
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a17e24611d---41497900285.pdf
    • http://futimisdev.com/userfiles/file/88934474440.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161404af3ee6d7---bidejifejorerunoguxulud.pdf
    • http://plkorea77.com/ckupload/files/35823990366.pdf
    • https://medosojewellery.com/userfiles/files/momito.pdf
    • http://falconfam.com/ckfinder/userfiles/files/47093332899.pdf
    • http://f-kcc.jp/user_data/userfiles/files/vezotiwameki.pdf
    • http://abdon.madteam.net/ckfinder/userfiles/files/nojune.pdf
    • http://vstarmp.cn/upload/files/20210913_210651.pdf
    • http://qianshunqs.com/admin/upload/82341286357.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c8938d2b7091daa7e27bf617b2b5a7b0/texuxiforalok.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/25396266884.pdf
    • http://media-production.net/admin/ckfinder/userfiles/files/lolinid.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f06a027eb68a2bdaaa90649026f420ea/84307115604.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/15894471574.pdf
    • https://lexcyberia.com/userfiles/files/jaguwekiwixoliburatof.pdf
    • http://dolphinkorea.com/files/files/39588124385.pdf
    • http://synthecinter.com/userfiles/files/7495333402.pdf
    • https://somogyplusz.hu/files/88889251663.pdf
    • https://decoveinvestment.com/userfiles/file/pamexibolumewewozuzi.pdf
    • http://africareview.in/userfiles/file/603004262.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_off0000d61f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 16792 bytes
font_01_sfnt_off0000ee31.bin
247797f1593dd185b20bded61ae0c2f01c20e4b8e0c344b70d84abb7f2050725		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 17772 bytes
font_02_sfnt_off00011cb4.bin
c1c8f319c23c1b31834c400e0bd0d4f97e88802f38aceb4c1bf12502f76f306e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 10440 bytes

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