Malicious PDF — malware analysis report

Static analysis result for SHA-256 c690ed51e26f48c0…

MALICIOUS

PDF

76.2 KB Created: 2021-08-07 14:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0b9be773efb25f5386641b9d2bc8547 SHA-1: 1aa7766d693f1e24b60769c70293ee99d2cd9b30 SHA-256: c690ed51e26f48c06861e110918b297818eb812b31b5d451e703a196ece9a783
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple distinct hosts, many of which are compromised WordPress sites. The embedded URLs suggest an attempt to disguise malicious links or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3768

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.
  • 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
  • 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://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b3ff5a76d---gogizizaf.pdf In PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lotilefexebokenanamab.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/42614954757.pdfIn PDF document text
    • https://synersys.fr/contenu/file/xatakironox.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e89041618cf---kobasezibuwifaxogizago.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/wekap.pdfIn PDF document text
    • https://hearing-outlet.com/uploads//files/202108031313267739.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/300156066065.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/299e342ab18a4409f9fdcc11fdb6015b/famosilefifip.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821c55440f6---66631181263.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02743465b---kabovanubaxagiso.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c955655c56---50975406016.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ce059e98---buzobi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdb65ab83d---81887627167.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2494e2bbad---zexesidekexaxitez.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/lthhajugkv1ahrh40p0mjrlmh5/46138866438.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086db564a4be---domobokobujuxe.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16081e8c935049---pekufododuxusoze.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2c45b98f23057fe6f4054bc43e683197/22905455550.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ae665f08552af9431cf9d0ffcfa1a872/34701530227.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/duvopigugak.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/91511194526.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/8950625552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+use+tefal+easy+fryPDF link annotation
    • 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_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 18120 bytes
SHA-256: 653c5d4916043d98effce9a664606b91130d21ca46576f679ed15d3df7811a4d
font_02_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 10304 bytes
SHA-256: 60285c765cf7e1d429d91664a197ff0b32af3b07f2c7f4800009e9bcc2a53a1b