Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0a5019bd904244…

MALICIOUS

PDF

84.2 KB Created: 2021-08-14 02:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97987ae889c2fa8371a95d4e1c86297f SHA-1: 49e53eacf10bbe96ee5fc7a701a849bbb2496bd4 SHA-256: 5f0a5019bd904244aa4e8cc1111d59fe53e5a14d5d5503fd28a9df840274a1d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The primary function appears to be directing users to potentially malicious external content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7cmqkbk1ag63kagojfoavp4r9t/55479037188.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160949b603f4b0---jutanudowosupadiburezazu.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/23340377460.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074527517621---gobotixo.pdf
    • http://akhsmombasa.com/clients/861898/File/fipisovedupotajuzoxare.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093050412420---49931952880.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc4fcf1cf---bukulup.pdf
    • http://ixtvs.de/_upload_bilder/_filemanager/file/wejusunulod.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5475527ef8---jadiv.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0251d75a61---nupaxizo.pdf
    • http://dallapietamarchisio.it/userfiles/files/54952588731.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d3e37f30---lopufod.pdf
    • https://gangnampools.com/contents//files/34953678028.pdf
    • http://b-solutions.net/userfiles/file/91786236786.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce77717fc8---83920730997.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/72pu0p416ql66anmh6cqsrph1i/rawexawebusomotokeminoxa.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b34762315a4---xawarina.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c30611443e1ae9d7360c3ad2edfc246a/24796970883.pdf
    • http://rollfactorytogo.com/uploads/files/legixizamadozalumidale.pdf
    • http://cuoredicane.it/userfiles/files/94381601457.pdf
    • http://rexant.by/upload/editor/files/bifosetexekiti.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=from+inquiry+to+academic+writing+5th+edition+pdf+free
    • 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_off0000e320.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 16792 bytes
font_01_sfnt_off0000fb32.bin
cc41e5c9722f1c7161870fd0fc6351948fa9f8cce264ef7757e695a8e21fd544
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 17140 bytes
font_02_sfnt_off00012811.bin
84245bdf2f2711403cad31ee64219fe38723ffabc345e3a30121d75f5932eb0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12811 11412 bytes