Malicious PDF — malware analysis report

Static analysis result for SHA-256 2242da26fa7d5b76…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 18:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bef265504adeb942e47d96383e76801 SHA-1: ec6bc378925d215768cfc89a78f273f203abc159 SHA-256: 2242da26fa7d5b762c144148735dc5a6ed7dfd4c96c20748099720797b05661a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of multiple external URIs and compromised CMS upload links strongly suggests a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://studioagm.it/userfiles/files/xulominuluxufogujilu.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/f6ovu2dccv4aitdnlivf325pit/11779273390.pdf
    • http://denis-lefebvre-services.com/fichiers/file/27158460224.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d23c6943---fatitusutifat.pdf
    • https://arerp.kr/data/file///wolodebalonimeludetani.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c85108112---92098826006.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/11722333263.pdf
    • https://smithsgame.com/calisma2/files/uploads/87569877768.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/f7vrtiobmmmsc1m7hqj4j7ajqa/wozagewa.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/21766948952.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/32651107742.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea80a65f4f8ca11ad478c7a8721eae74/49812924400.pdf
    • http://splogservice.ru/content/file/tadozanufatixiduva.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/salv68qpa34sua1kcf1pmv8c92/xasizibijuwunowaf.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f486f141ac---vazonoxanebonal.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074256057077---rirewinaj.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cf524a176f6f602e81e6026368c350c2/71110293616.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6lpdd17ou8717puhrmnehpsf5f/43396032209.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/fifidizadepoxubawav.pdf
    • http://amandamaitland.com/images/file/pefarufemikafaxiluxilosud.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/snjq0b0n6cng1bgd162c82mdmb/jofis.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2d684f931a5b7f0ae3e7e6ad8fa29810/vawumimawolalemanegeju.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d04303856---veralijisax.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99ea609cf---18305281576.pdf
    • http://xn--dlek-5qa.com/admin/UserFiles/file/3161412268.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3321fb04---mejesabeked.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ms07l9ndu4e7cbnc5bsirti4o6/nemapizevafitonorutawo.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ecac17d3---63479193683.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tool+to+convert+pdf+to+excel
    • 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_off0000f236.bin
9a2ef8b62e17c1b32ca555d5d2f638be289ffa0af605760f1129cbfd1bda1dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 10320 bytes
font_01_sfnt_off000109a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 16792 bytes
font_02_sfnt_off000121b9.bin
a6616b51b8238c4cc98a9146f977ba8c610a324d827f8da5b3f105e082427e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 17420 bytes

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