Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8eb05eda5ebe4b…

MALICIOUS

PDF

96.2 KB Created: 2021-07-13 16:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3c463f7c3aab390657eea467aafaa70 SHA-1: a952bff87b661009701169fb58a34ce6bd6b8c8d SHA-256: 8f8eb05eda5ebe4ba0772b15ad88bb73f0ff57ecaf2c607509eba86cf454ed25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised websites, which are likely used for phishing or to host further malicious content. The presence of multiple links on potentially disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0be15ca1a---13333766659.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf27641ff90---60754143388.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/de7e792dc985cd14a8df34e28979f82c/karuwewexesula.pdf
    • http://garderoba.sk/images/_file/podujif.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa16c45df1---burenidonor.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd7b50ea94---27584294850.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a2a0c00168f5033704cfab00ebfbea16/wisafomotujonefu.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d538muvv5lu80769keiuvprob2/xoragafuvumaxeliparo.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a2ac371772e16f79fcee2c840acce6ed/vusapatox.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/49f1a6d147607a6bf508192a5970e7d2/84752626579.pdf
    • http://falerisztika.hu/tmp/20567240481.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0h7r6lmq9ctmlhl0eut0k5vsln/47892084914.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/k4obfpjnbbamdqu6gk71mmfgc6/tusobisamigat.pdf
    • http://www.toptehnik.si/images/4376147089.pdf
    • http://busankid.com/webfiles/board/file///71553911111.pdf
    • https://red-adlay.com/upload/files/28935419073.pdf
    • https://annekienlen.fr/imagesfile/tokisalu.pdf
    • http://china-zub.ru/userfiles/file/54456485165.pdf
    • http://khacdautron.com/Images_upload/files/34159606329.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/705865ca6246a983d1de46435bc02295/95727143630.pdf
    • http://akinmedical.com/uploads/file/14739785957.pdf
    • https://serini-cloud.pl/uploads/editor/file/35991882846.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/vkrutgmp9o2g9b98fe5t5l9l0v/41760798233.pdf
    • https://okazdedziecko.pl/_files/Media/file/56383779937.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=isomers+of+pentane+structural+formula
    • 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_off0001100f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 16792 bytes
font_01_sfnt_off00012821.bin
d0174f8686271c2b6afea4f6354a3c5b983bb933aa758a8754e58dd13ffa817b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12821 18632 bytes
font_02_sfnt_off000159aa.bin
31da383e9b3b85524b43308286fe0b1fa807bc9e3dade7a4da8df2bae60bfb21
pdf-font-stream PDF embedded font (sfnt) at offset 0x159AA 10600 bytes