Malicious PDF — malware analysis report

Static analysis result for SHA-256 846a91d4a82914e1…

MALICIOUS

PDF

112.2 KB Created: 2021-07-07 16:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92ab344b65b0581a1b0669e4ed06e202 SHA-1: 2a0e6869578a15b04cd3ccea1999d9834c4ea9e8 SHA-256: 846a91d4a82914e1d2505a6164e088439eecca1cde9f49129cee5d92da06ea14
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised WordPress upload storage and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://euroroma-bg.org/files/file/35793029665.pdf
    • http://atut-biuro.com/uploaded/file/riwusuzatagisuxom.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1bea2e9c---59369504695.pdf
    • http://joy05.com/_UploadFile/Images/file/bosekulogedejeva.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6qvrfia2e4fi6shita74tleum0/nekemasisesifofe.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/n1fu78o4npgh03cv9aq17b9ns0/kiwobofipupoditid.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/bekomepuwodumetina.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bc802622e---84367457620.pdf
    • http://tfh-filter.hu/_user/file/17006609360.pdf
    • https://paron-rebondir.com/uploads/files/ligevivom.pdf
    • http://sushimura1.com/uploads/files/86351366118.pdf
    • http://hasici-pristroje-eshop.cz/files/file/66289071637.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c66d45cb---fijoxixe.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080245a51f91---tarafekafek.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/79ea3b356b5b62750870c6abee4ba40a/2813539206.pdf
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/48483448253.pdf
    • https://sharmtocairo.com/userfiles/files/35427045414.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5658b11d960ef854e613490ca797083d/48118189041.pdf
    • https://girilawfirm.com/content_files/files/rokexuwu.pdf
    • http://minicabii.com/survey/userfiles/files/50627288941.pdf
    • https://atamergranit.com/userfiles/file/35603161190.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/db6fae798351aca0ea41183defe5367b/87608461726.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f8b82856d---zinixonum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=synthetic+division+questions
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e812.bin
520fa728111461d7e91986d1bb27695479ec2028b5243bcad3cae6365ecc1569
pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 18704 bytes
font_01_sfnt_off000117dd.bin
74334bd89ae7e29ec80ac17c67292dc678aacd20c8c6f6c6d3dfbcaa3e2936a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 10660 bytes
font_02_sfnt_off00013014.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 16792 bytes
font_03_sfnt_off00014822.bin
4601011c8158806a904f1781ecbebf242fb35333dda20f5adca60446a1155e69
pdf-font-stream PDF embedded font (sfnt) at offset 0x14822 38492 bytes