Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcad475804ae24d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 11:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f3b359eff89a1930eb1a42be46ba1ef SHA-1: 07a8b08021b808f6fc9da88bfd94604a849a7cd8 SHA-256: 4dcad475804ae24dd04c34b78f38b1637e2662a4e226c05dd827fe90980d453a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://slide-bearing.com/d/files/11753281762.pdf
    • http://dgxzz.com/uploadfile/file/49499686411.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05a2e1399---lifisedakareg.pdf
    • http://coimbrasoftware.hu/images/uploads/files/58310595120.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/34b28fufarm7cjs4p0fbd1rpmt/82397702083.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613886f196179---45483726011.pdf
    • http://yummyschool.com/_UploadFile/Images/file/26773666601.pdf
    • http://zbigniewrodak.pl/galeria/file/gemox.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6bfdb4e1c---vezofi.pdf
    • https://akvanova.ru/sites/default/files/61323977361.pdf
    • https://tedvandergulik.nl/userimages/file/rolajalonomeguwu.pdf
    • http://innova-perila.ru/upload/files/digutuxukuzul.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0d2b7de7---59988159698.pdf
    • http://kbinteriery.cz/userfiles/file/sogazogavipawaxifirudive.pdf
    • http://hnkingdee.cn/Files/file/20219222187.pdf
    • http://wjcopy.com/upload/files/52045959792.pdf
    • http://noithatmfc.com/media/ftp/file/42800932482.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/924c96c516e60f1b6485b4353a5de319/3773995586.pdf
    • http://poledance-chrudim.cz/files/file/nopuxuxidejekirubuvi.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/71280962175.pdf
    • http://techmechengineers.com/uploads/mupatadewepasuf.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/vewabedobovorusitegejef.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/gr410u51gb0qjeivs3q00rh0um/75851325079.pdf
    • http://rickgrisolia.com/userfiles/files/mavusewelurukunuvegobe.pdf
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/vuxifuvumakok.pdf
    • https://nasikampung.info/contents/files/7766822792.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cool+things+to+build+minecraft
    • 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_off0000d411.bin
125f819a368692f3029fb0e2fd525d3df67bac669dea2973d54d8d9bf2d30aa9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 17192 bytes
font_01_sfnt_off0001009a.bin
94daac83fbbb1cae7f708558ce4b58d2fb4848af9544482efe7a841dee106172
pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 11196 bytes
font_02_sfnt_off00011a61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 16792 bytes