Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f68448a9a21168d…

MALICIOUS

PDF

87.8 KB Created: 2021-07-01 23:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6de8c0b4358eba1815c90157344538ab SHA-1: 69ffd4313587edc368350ef7ba44e514b1c5fbdb SHA-256: 1f68448a9a21168db75847a2e99006bcdc8129028d56a1e1a87cc0167bbdaabd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the true destination or leverage SEO tactics for malicious links. While no scripts were explicitly extracted, the nature of the links and the overall detection strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=is+a+blue+whale+a+herbivore+carnivore+or+omnivore
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fehvamuat2jhvi8l0in66fnvut/18902869557.pdf
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/lixuvojibup.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc6fa3f750---93391329587.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/75205233920.pdf
    • https://carrieres-pierre.com/userfiles/file/70556120985.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17e0d2ec9b---63007638379.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bdabd013804ac31b82615d1402c22cfb/95108814696.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/d65dd2b958fc5414d801260c5ab3067e/wifinekejodutefodatud.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d9216dfb4---46772629395.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0o6q1iah4su9s8ni7pj1ru8lbd/riboxixosu.pdf
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/56152043919.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29df2b1052---sawarujuvitibe.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/lexededesotujejibexotuwi.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/jt9086c9346v0rs5uoqvlq6s94/96607715099.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/31726870055.pdf
    • https://kaptenhoki.net/contents//files/zixowewijokedimi.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160783b62edef6---sojuxebajajemaxukobas.pdf
    • http://bruntpratcher.com/clients/4/41/419cf983043b9371e8393ecf97d676f7/File/zezod.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/lufumozodejemesovowago.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffb190644---kobamozojizewobemonilulex.pdf
    • http://dkmmotor.com/files/userfiles/file/97322190061.pdf
    • https://livre-art.com/ckfinder/userfiles/files/81924006750.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c106446ca26---45614271187.pdf
    • http://cosyromania.com/media/file/94189763903.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_off0000f2f1.bin
bc9899ee0dfbefb02e31483c5c31bcd8d0369c5267bf523aa5c8ef0fb2eed03b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 17584 bytes
font_01_sfnt_off0001211f.bin
e36b9dbef97041ef19a1524daf44a539df7cfe1c887c4efd5eb8762d33916aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 10740 bytes
font_02_sfnt_off000139aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 16792 bytes

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