Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f69f7c52e6d163…

MALICIOUS

PDF

203.1 KB Created: 2021-07-18 15:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6561b312b33ebb0e917b3866d74db2c0 SHA-1: 8ff0ba3025c36531243d599feaa5b1767b955861 SHA-256: c8f69f7c52e6d163bf2292d7ff3378c82b27cf80f3e264bf41762e21bcc7a881
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9808

Heuristics 5

  • 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.
  • 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 http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160725c8d422ec---zozegosuget.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd2c9d51c---sajoloxafozupotef.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/somaboxetu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcfc0b334f---dufuverovumupibugo.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/depamapowulopigozidu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/9ff523685cdf82ed6c0e67e0139ba16b/zopadegurojewexu.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/lixufifira.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/s9uvs6lh4n6ovmi8ndf6qv62ng/94941158294.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc10c3bcbb---pafaxij.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/jixutisowuzuj.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/25849726517.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfb348132174e6acdb5d63f75e686503/fofeduna.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/8722954945.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08637cc8be---98772852051.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8428abeda4---tifalemojukaxexozaxijila.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/90488981296.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rhjtmrf6fdkl81pd0ev1f177s7/48170947763.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/82ce0c7d4fbda7b4256017beb0157326/64107708511.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607674a49cfb6---zipepezif.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6492a2f3a8e40853c752e43befe295ef/36483664389.pdfIn PDF document text
    • http://metall-press.ru/files/lapebotatikodige.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/birumeza.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/741271de17550c216879a4bca12654f0/52122529084.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/35747599624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=prodigal+son+in+scripturePDF 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_off0002ad94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AD94 28968 bytes
SHA-256: 89bf6dbdd6731686a01a739fcbe68522dcd38ee8d7b4c4549aee1e9ffc9820bc
font_01_sfnt_off0002ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED4F 10788 bytes
SHA-256: 9393145ae39eff6412da4fdc88a78a1636bf8891d422e77e3929aa3ac003f58f
font_02_sfnt_off00030613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1