Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e2e98284fdb770e…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 08:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d508bb4f6d08994be548cf2bd16f58c0 SHA-1: 8ee2e181aac1aa752035815b4fb13dcb7236b4e5 SHA-256: 2e2e98284fdb770e5d779256d59b75ba3ddc4c080a2de09873056596534adf99
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/256c1ff2a040d9ea5eee58e6928b1a1f/94389568587.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/rosasuzula.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a6883121---9167095076.pdf
    • http://bundoreh.com/fckeditor/files/file/vinudifopawalupaxaz.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dd0389d04e6ab545c391974d138f55d2/vijizutigaguvar.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pe56db2m6nfr50s7ur5tlhunpr/42171910601.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e7da1335fe6b0f279f73c516254b3776/64093042766.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608563f28d231---guxakagorogebupan.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/24e673ed837453d887ae719e9a70fc9b/30818910863.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbc37831f7---dovakodaragamudabim.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/be2e4871076b8597eca85ca9b0fb66bd/sedapisunovikewemegit.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96cf59456---67552424534.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/r0t3esu2t23qras3sorcj27lik/56018394772.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3215465ca7---pesupulixorijeluzapiwi.pdf
    • http://retco.ge/ckfinder/userfiles/files/fozanezofuge.pdf
    • https://abeess.com/userfiles/file/vakilupetiwemidil.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6162101c1c35940bc533499e35b68e59/rebubavuvew.pdf
    • https://mobilieroccasion.fr/uploads/file/ralawizofet.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608163f432632---62789052376.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/b3a7otbmdns6nsf1e7e5fultq9/28078765129.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c406ba9c6fd---dixaxa.pdf
    • http://kenshopvn.com/uploads/files/19438198885.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=5+sentence+of+conjunction
    • 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_off0000f784.bin
2f66e1ed5bdfce1a33d4e78206fb08ec3ccdd46df91990bbb4ee06712893d37b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 10288 bytes
font_01_sfnt_off00010ed0.bin
5798c065eeb07bddbedaf9b6ca2edb57ca78855294a02abd825c212299f0dda5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 17120 bytes
font_02_sfnt_off00013b7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7E 16792 bytes

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