Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2933f3d1998247d…

MALICIOUS

PDF

104.9 KB Created: 2021-08-19 10:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7b347956503abdc8267821d9cc5ff1de SHA-1: 7577baeb44eceefe757421ba57b36dae6cc69738 SHA-256: d2933f3d1998247ded3bb6ed31ab13c938545b94ed94aa596b3df8da3eb8069c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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
  • 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://gespk.com/userfiles/file/62718253643.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/64crm0ga3tjkt6e44qn8d5iik4/39975834370.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/dowifewakejaveropuva.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17b8e2bf0---38855522013.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/kezisemexupesuronaviruto.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/v5pp5fnivfung3f6plkolfq731/32318434292.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pt6eg5inhed37811odik3jhcd7/rijed.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/diwedifozuzujovixisiwor.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5e4b4dea1e131c4e37d8be906a6e1431/60865114277.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ccfac1aa---72244284567.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/sunuwavizag.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7d5e4b6f9d5e094928f4f3eaf64708ad/76032223773.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a986f91972---rebivopidum.pdfIn PDF document text
    • https://bamor.org/userfiles/file/pumufuwapaji.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/317e7cbcd6bac8b5747028f476f495b9/78888038947.pdfIn PDF document text
    • http://fitviewer.de/files/file/10330191693.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/xabefetab.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/49900231690.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a530a032---51404020355.pdfIn PDF document text
    • http://rayer.cn/d/files/vududatewolamaden.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/24235245323.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8e330a4b---kigera.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/xisuwesadulujejin.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/lapepulikujelobipeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=descargar+libro+para+colorear+disney+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 10952 bytes
SHA-256: 413a803142e9cfa2081984642e615ff71b971d95e96486360a106a71e454a64d
font_01_sfnt_off000136d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D8 18816 bytes
SHA-256: 9e8a06c0a4a8dc10e773876aec030f7f6ff89dfc7654c86b789bbc7f1be49c42
font_02_sfnt_off00016679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16679 16352 bytes
SHA-256: 470e290952ef951ede6d6c7d5ca63c035db2632a033eb4bcd74a8159b858b555
font_03_sfnt_off00017c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1