Malicious PDF — malware analysis report

Static analysis result for SHA-256 2874351dd7d44e07…

MALICIOUS

PDF

133.8 KB Created: 2021-06-29 01:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8af0f0db8df50ffc245af99e3f36bec8 SHA-1: d9d04c1dbaedaa18c98077038b9695d0428bdffb SHA-256: 2874351dd7d44e07e6ddeecc1484571303f93cb0daf2a3049634fd2ea4e49c49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://laborke.ru/uplcv?utm_term=strategic+management+is+a+process+in+the+formulation+implementation+and+execution
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f548cc924f---74637494812.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sp15fh4uc2ru5vai650rh2tdqk/93014940922.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/4557d13b7dcb2f76158c8c81a870a9b5/tajaso.pdf
    • https://ferado.vn/userfiles/file/53310559231.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963bee0ba28---40314903659.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f71ea9016---84528180577.pdf
    • http://riskhedgetech.com/uploaded/file/135917013860bdafccadefd.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/tqj0k16a8cssvngm9ofie9m4mp/gilavifunedufevovub.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/uhr7jrn42pn29fvoio9g087non/gumonogovep.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a11992ffa---88751251863.pdf
    • http://pressvaluation.net/userfiles/file/56271682984.pdf
    • http://aeronautike.com/userfiles/file/56282441211.pdf
    • http://etcad.net/np/upfile/file/82792046110.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/68724271872.pdf
    • http://www.biotanika.pl/upload/file/xizaresuf.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160750ffa3c716---18098188859.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/05f07ba6a4dae76dd820e297578ce632/jigatoxadobevesujojutuse.pdf
    • http://www.findvoters.com/userfiles/file/buxewagadanegivagex.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8cd1bae28---menekinivo.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c76f468ae---vujajadiwofiv.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba33c4b083e---bukalanabobofugoromaje.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f8d69603---rufosigapisijizixezolel.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/74f476caa9f953e502c48ef04be48a3b/rodobiw.pdf
    • http://automsystem.com/UploadFile/file/20210508071723173.pdf
    • 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_off0001a9a1.bin
4f2f7e83041cd7aaaf015749d6b064b09287c1c304ad4433d456ed4c15667904
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9A1 17196 bytes
font_01_sfnt_off0001d62a.bin
7f8e1647f7defca6f638f1673de3ab8e65e5d02f9641cb2bbd44c35e02887a73
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D62A 11344 bytes
font_02_sfnt_off0001f06e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F06E 16792 bytes