Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c31e5c38ad443ef…

MALICIOUS

PDF

81.6 KB Created: 2021-06-29 23:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d44ff11f6693aabc94f3ecfc257c990 SHA-1: 17b82590e13152cd46dc26be7a77826071733d1d SHA-256: 3c31e5c38ad443ef76065da4d9d2700c05b6495d5170b788001cc8aa10aff7d1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to potentially compromised websites or disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://queure.ru/uplcv?utm_term=mahjong+solitaire+epic
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9cf6b1d825ca35f40199470801e20bc8/27940613941.pdf
    • http://toonesk.com/upload/7046128163.pdf
    • https://circolodelpistone.ch/userfiles/file/80202308672.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160744f2d0381b---99434934563.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/87vubvj1q57ch7e6nntuaat947/14971857130.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2b2d1679348e4fa5e18e86587cee8a42/1593214984.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d37ad7b50b---63882779745.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/56fe5e15f9d068f256d142deb00064d4/35880561284.pdf
    • http://cnex.cc/images/blog//file/58347466254.pdf
    • https://grupo-kayros.com/userfiles/file/sosisam.pdf
    • http://asupuro.com/user_data/image//file/11884229804.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/qes8t9jg67rac6n5mdp3s8lh5i/kuxoboni.pdf
    • http://headrepublic.pl/images/files/96518861965.pdf
    • https://akapacha.com/userfiles/file/8650888664.pdf
    • https://harrisitalia.it/uploads/file/fubolagumewobefuwubin.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d1791dcefaf459c521f89e7ee9f18b2e/jikirogomufesoli.pdf
    • http://quadocdao.vn/uploads/files/sunidiwijawafefegesevut.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_off0000de49.bin
0af0ef98b0b594d5225951180f3503549f1fccadb1246a98f60fca7f6292218c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 10776 bytes
font_01_sfnt_off0000f703.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16792 bytes
font_02_sfnt_off00010f15.bin
93c57b39e9adf7dc1115418a251b6f952fb9e48d01607becd94a1f8ba8eac479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 16524 bytes

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