Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cac35abbbde15a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 04:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9917c3549e25277c9cc38ddc06bb4e66 SHA-1: 62ee69a6d22c4625b5ec5332b26e7a2827be2359 SHA-256: 05cac35abbbde15ac2628553a0b1cc3dacbc8e6a27c518d8f53003c67b30fef7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=general+knowledge+quiz+in+english+with+answers PDF link annotation
    • http://bpabv.nl/uploadfiles/file/73783151513.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/39907829a157b2efcfabd1c01655bc4a/xabumam.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd1783979---97552737621.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/1731969015.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/37730824276.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/eb931a4329ff39152e91fa9fba2ac284/bokuzuf.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/84374351753.pdfIn PDF document text
    • https://epiphanych.com/images/file/14655917199.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/96799950066.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/v28pvbs818loq6vcra2joeqkpt/lozuvabidexijijetopubaxe.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2be61df4---wepamojakagutow.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/51f572a49d1a7be6f4289d88c622ca65/gokuw.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/lutukotarudulixinudimej.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/141620129193.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/scg036gt4klrkttu134g801p1k/dalimetizelasagujunelifa.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611908cfce4aa---boxemureruvag.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a7a72312f10f6d80a569cac4123102d8/majuwuxunududufetet.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/caf53780c1c54bf21f58fa5e840c1f13/50545171883.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115bd157c174---sijidofim.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/kovofuwawubejusogo.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/84542848977.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095456160daf---jilimufemugesavamijoxobu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/544516c13355382ae6bed5035c074b9d/60457555393.pdfIn PDF document text
    • http://medlab.webd.pl/upload/file/pewirexejas.pdfIn PDF document text
    • 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_off0000bfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 16148 bytes
SHA-256: e5538bf6d42f8c4feb386879d51dbabd78232af2d783a5ad92f2ef451dede376
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 11052 bytes
SHA-256: dc0e51fcc8176caeea0ce19174f0ee88b71fd0f47f73ec44cb49e5f1aad276c6
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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