Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5b7d6b658173ee…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 19:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b11acd8c67d95797fe207187a7ff212 SHA-1: 4d9806f2ec27e51abebf42a5114db78e151c7a55 SHA-256: 6e5b7d6b658173ee0e102378adaae6de70d36243a163069493dc2750ae7a169f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be disposable or compromised. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ubranni.com/uploader/files/12614461993.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1062e74a---pijedekagixixagikujana.pdf
    • https://kaowei.tw/image/files/20210905_121811.pdf
    • http://www.sudaff.com/pics/file/65431117222.pdf
    • http://wahluenfty.com/userfiles/jilofogasubukiwedo.pdf
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97668254833.pdf
    • http://aromaonly1.com/yamituki-n/uploads/files/50081417526.pdf
    • http://dwornawodzie.pl/userfiles/file/21891582516.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/831fcbfcebf4988a4d88b4dec5063196/35540279377.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613881c03be9c---gerasujozubowosajuxovad.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/7751722858.pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zipubapane.pdf
    • http://wangyiphk.com/userfiles/8714339810.pdf
    • http://ausafe.net/images/art/files/wojibodojedapotu.pdf
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/fusonafoperejopuminexipaj.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613854730a656---lukuzofikalatuv.pdf
    • https://koncnc.com/genelresimler/file/35404676339.pdf
    • https://hotnewsmd.deca.md/upload/userfiles/files/vedukil.pdf
    • http://rpsbchamber.org/editorData/file/64239249490.pdf
    • http://tk-weld.com/images/library/File/gudufuwineteka.pdf
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/zamepakigakimokuk.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/barivikibizod.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=flc+commando+mod+apk+download
    • 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_off0000d910.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 16792 bytes
font_01_sfnt_off0000f122.bin
84e901583dcbd738619735b9cb438a49602a09ecd3858633fb14d88f9e717bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 17076 bytes
font_02_sfnt_off00011cf8.bin
c311a9373852753d30d7c0a4eb054cc101c1bf49850895f5bbf9d815d373e2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF8 10240 bytes

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