Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2abd88320155a2…

MALICIOUS

PDF

94.3 KB Created: 2021-09-14 08:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1bb1540bc59950ee98042b65564f7106 SHA-1: 5632eec5b4709c2e20b79f921dd458c111ceb27a SHA-256: de2abd88320155a212aad5c74fef55feaeb012e89555a822e7ed9bd8e644c42e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection to malicious content. No scripts were extracted, but the structure suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de1f086b91---mimefonuxezodo.pdf In PDF document text
    • http://modernplating.com/userfiles/file/lajixugokoxugizanela.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/tozeteverivojixarenevo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b34715ca---pafolaligazilozikapik.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/93563208029.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/dipefog.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3de96cdc2a63ced7cb31a480bc195cc3/zelamado.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/soloxefubup.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109110348443719.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/nexaregadexosedosab.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/96920270154.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/subomefitobebufisaxipe.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/23542421532.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a281d01089cc940f2d241bb919fdfa7c/wunibebadadej.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7d8d07618---kazemozisiwenuterisamoj.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/vujebag.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/50470902552.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/kamon.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/32697371972.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/79086554330.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/75359725604.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136953e124d4---17567356575.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130672722822---74121168634.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/53359037323.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/saronawakutefezuposazu.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/24526679170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=nine+songs+full+movie+onlinePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 17392 bytes
SHA-256: 5711995e680586fd3734b6f10b503b902de0bbcec23cc723a805d547826f0075
font_01_sfnt_off00013bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D6 10340 bytes
SHA-256: b83709767bad07e9af58bd12bf452ea4101d5252b626e1add17bc72128020109