Malicious PDF — malware analysis report

Static analysis result for SHA-256 613a34225c0d2717…

MALICIOUS

PDF

87.3 KB Created: 2021-06-22 18:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b2e510073c3bc875432bba08472e4450 SHA-1: 8859aa97b6e3d0809adb244cfb8a6e67ca010b45 SHA-256: 613a34225c0d2717f2e9d52e5c3fd31c54b2092a2ca904836be545f6a54038d1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9049

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://capital96.com/userfiles/file/lilunuvenamigaz.pdf In PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfb380e59b---bavel.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1aa86e9f---22924012764.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95718305a---vijosipewulalowume.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/66616441698.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d34816f6---47340060872.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/68394311895.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fe4db61c7b128654b52bf0b807dc3263/87039702712.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/dufitenanadu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160708222adedc---tukiwulowawupipovidu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kv8bglkfakui9bv9peajm3ut32/retegobifideti.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/popujeporopivuwawof.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1567db1b4---temufinivifunap.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acf60ba31d4---98914539355.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/6688129732.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/19bfffbef50dad0a492ae92739ba7859/84283168612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+kommentieren+linuxPDF link annotation
    • http://scripts.sil.org/OFLIn 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_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 4796 bytes
SHA-256: fac1fb4163807577cb0f2b32cd5cbb354209ff8f0601c1d08d9d92a3dead7672
font_01_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 13012 bytes
SHA-256: 575fc8a8f110b999e7c77066b64af8bd944e2b16127399eaeea902c3c442ea94
font_02_sfnt_off00014b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B66 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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