Malicious PDF — malware analysis report

Static analysis result for SHA-256 304ccbd140535fc9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 12:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7acb9a3ef05b428d9a80e8b5a8e0fcb1 SHA-1: 67a5f10d62260a78e89475c2917c5d1d11781537 SHA-256: 304ccbd140535fc9a8c8dd09849f6d7fb70d5cd591fd9484a8631419bcfe1cbf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites hosting further PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for potentially malicious purposes, such as phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ftb2873g8lugluv80lqml5ujct/gekekapapugaziduse.pdf In PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/masufili.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/boraba.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/tapawuxomulubopiso.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/rexabolafidas.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/85411975937.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf1a4ca89---87243820014.pdfIn PDF document text
    • http://ailizia.com/userfiles/kuxawinovunozi.pdfIn PDF document text
    • https://istanajp2.com/contents//files/55996096987.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/64812640600.pdfIn PDF document text
    • http://xsteelstock.com/d/files/86121094044.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4rcr208l6ij6mm2hib27tuctkk/59270186348.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a068173c0ee---koxolimaxoduj.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b424ede441---rebegazaduwawoluwegarak.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08d115237---lapilokofetutebegetuna.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/pilepinikazutopopubenejom.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/fifusasap.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16126736fe5be3---nijelagetura.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4c3cf2f940b8bae1f6ed711e5204f99a/19618759599.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ac3d5a210655d1ad49359e5682d09722/gewufoguses.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/vejagawixa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7678d9a36---sisoxegubidivewaf.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d90056e6f3da10fa0b4c9b50c354df16/70942540801.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c401354bc---76283772073.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/14654693500.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c920f3ddf3---70992179352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=data+tables+and+graphs+worksheetPDF 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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 17264 bytes
SHA-256: 705822cc69797e0be93e9711449d0993f716ee2d5da818dc7ed4bb90b078a3c5
font_01_sfnt_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E4 10900 bytes
SHA-256: 3882ba3004f6ca4a0aa79111940d0d28e4577cfe37ab6879fde1ac6c27bfcb79