Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9482e30da3d9b0…

MALICIOUS

PDF

80.4 KB Created: 2021-08-20 05:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8a3f216607e677e1b15f9537a0bca2b SHA-1: 7b825efb71ffe1fcfba3468942338db7bb72323f SHA-256: 7a9482e30da3d9b09e6750bc5d806b783e45ba0cee18d3ef403edc9094d745c8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://foto-klub.dk/userfiles/file/48238095984.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/98136582576.pdf
    • http://c2ctrading.org/cms_upload/files/raromatejim.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/33d455a9a71d0f4d80cdfd6745b13de0/38975390011.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/41qpd9fkm1elan0na91r6op6jm/83178986975.pdf
    • https://holocaustresearch.pl/nowy/photo/file/16468026468.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb429ad596---keralobobovaxolurajozedoj.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0bca6250---lixesokepolik.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/zililumexavirigu.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/konaduzunez.pdf
    • https://sofupingame.com/calisma2/files/uploads/70902625306.pdf
    • http://odpadykj.cz/UserFiles/File/41084518239.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gab5jhingc3je5p2rk1053m1ij/japuwibev.pdf
    • https://samsungklimamodelleri.com/upload/ckfinder/files/8280347560.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/vawenidisufa.pdf
    • http://mintaialuminum.com/d/files/sobivikijululemus.pdf
    • http://sportgalaktik.sk/userfiles/file/98901103323.pdf
    • http://boek.se/bilder_umeny/File/29764755147.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=essential+french+travel+phrases
    • 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_off0000d72b.bin
767fb3189af12d5e5f8ff179c3ba90de5ce56837c0de4514d8449bfefb85cd0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 18304 bytes
font_01_sfnt_off00010447.bin
dc9057921e923b067baa37ba4513957ce2bed3d0448c56629987d326fb147b3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 10508 bytes
font_02_sfnt_off00011c25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 16792 bytes

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