Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8bf112a50835eb…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 04:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b67cb89a0182cac54fb91173834467f4 SHA-1: 34a18851ee89198765822777606aa67492840669 SHA-256: 6f8bf112a50835ebe210389d171eb56ef12235c7a3b3fb63a61e0da516601374
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/65a59a17e583893aa0b5595373c90be8/dotalasamawe.pdf
    • http://usmleworkout.com/files/file/28277449098.pdf
    • http://e-skala.pl/userfiles/file/gigunikaromu.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/usnimgvqj7v265crggdmrk64vu/19547483901.pdf
    • https://clickkedai.com/userfiles/file/majezi.pdf
    • http://cityfate.com/files/files/39465448277.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ip1jknk9tj6vp9r6j54mvrpk6k/20876561786.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42ff1e1f8---runasegugomosutiwimuliv.pdf
    • https://madopin.com/calisma2/files/uploads/lijikoposi.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0266f3c214490b9ffc1f83f1bd1f1c93/poraro.pdf
    • http://kleinschaden-expert.de/userfiles/file/5265245042.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942bd0f3261---naviresalalozevenamimuj.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47ccc97d58---93651758251.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097874be8242---25384452261.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ed583184---malanesasopinawutigipeli.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080411f4af41---92152450232.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160830fd732d32---96947019041.pdf
    • http://bamila.vn/luutru/files/86719860391.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/94572692849.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/daxipefezemeturatubizeve.pdf
    • http://tecnoservizi.com/userfiles/files/witifegezole.pdf
    • http://www.heksan.com.pl/file/sapijodinuk.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/89299834418.pdf
    • http://sam-global.ch/files/file/fidugadetov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=city+and+guilds+functional+skills+maths+level+2+sample+paper+1+answers
    • 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_off0000eebb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 16792 bytes
font_01_sfnt_off000106cd.bin
e6ac14090878efc6896d1bddf66ea33a538bcab3066b110b7eb8965c77278786
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 18836 bytes
font_02_sfnt_off000137fb.bin
f9e3eeb3b437add551f8b121f8370c5afb63911196aa1ccf889e3325d10195e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x137FB 11728 bytes