Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11e7cf5253c125a…

MALICIOUS

PDF

75.1 KB Created: 2021-09-22 13:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bf35d4b045d16d6eda442a970a8d923 SHA-1: f7e4bf4a397484573ab126758f252771c8073627 SHA-256: a11e7cf5253c125a97c2824fa9f5d90a516f9f652ea3358f6810aacf2ce31ddc
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=cannibal+holocaust+torrent
    • http://twfindia.in/userfiles/files/65548393821.pdf
    • https://tranthachcaodanang.com/uploads/image/files/lozulagonek.pdf
    • https://kermanrooz.com/img/files/tuwuboti.pdf
    • https://palezieux.com/ckfinder/userfiles/files/30672379647.pdf
    • https://palezieux.com/ckfinder/userfiles/files/vakonenogaf.pdf
    • https://hbfilm.ca/resimler/files/folugovijedubovapevo.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/78928570518.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/ginobujudomixejuve.pdf
    • http://orderkiwicafe.com/uploads/files/11275354393.pdf
    • http://thesei.com/
    • http://celeb.huh.hu/UserFiles/File/87313808882.pdf
    • http://polymer-optix.de/userfiles/file/48561128090.pdf
    • https://deshpanday.com/ckfinder/userfiles/files/60596763667.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/011316ea7bd140319d0defb15771fd77/36163332888.pdf
    • https://holycrosshealthcare.com/userfiles/files/jasufagilu.pdf
    • https://albizy.com/ckfinder/userfiles/files/67382878213.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614adf528b050---24405016263.pdf
    • http://gyogytornasziget.hu/uploads/files/23479608029.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/39974725054.pdf
    • https://idealist.ro/userfiles/file/kenefababalapegi.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lamebusivakironulejim.pdf
    • http://www.520amis.com/upload/files/52080488111.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19d81c3d6---85235361561.pdf
    • https://amatnieks.com/pictures/image/vujiteda.pdf
    • https://havadisname.com/upload/ckfinder/files/95272040648.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_off0000c0c7.bin
a80b7bce30359a372e232b7cc42075a12c53d5975c2038a753e1d519230354c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C7 17640 bytes
font_01_sfnt_off0000ee61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 16792 bytes
font_02_sfnt_off00010678.bin
4ef435251b4c06d0af2ab53ee37d23bb3ebc2de5176810c81825086f3906bffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10600 bytes

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