Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a7343226a7b16c…

MALICIOUS

PDF

97.3 KB Created: 2021-06-10 06:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9d0c88dd91df5a2ecbc6cb6d047d7ea3 SHA-1: fc39f5942be40ac52251cbb5d837095b6cb308a1 SHA-256: b0a7343226a7b16cb04c2f9748c295e7ae1f8ee791f87004b39dcb43d7742486
156 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 0.9996

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://catamma.ru/uplcv?utm_term=charmsukh+all+web+series+download+filmywap PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160928581db8b6---69557045824.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aebad8764c3---wuxixulafarugirib.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/roriwebilunadovove.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/6c59d79b7806533a3853cdb280339e02/15079086885.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/96042150324.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0e8d3a9eb1b88482e3a3542869af6f00/46450092459.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnbedejb6bckuvbelpqbbpjqnh/71262853918.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b603d1ecde8---kowilapunidimoz.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c9c5b9326efa0749b7e4133262ad586a/8261903877.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178564f73c---tinufotobotuneka.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099fee815fee---segumawubupep.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c1674a2316f479071ef11bf4e500f0fd/7224571207.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab6867721---90613642309.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/wokufikasemodesijidisimiv.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/d24e1c083ab6506638f8392e960d0836/45617263204.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 5584 bytes
SHA-256: 5922d1c984f77ebdfdabbe317cd4ddd07c7a292a292d10ec76c2a557838d2503
font_01_sfnt_off0001175d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175D 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 10824 bytes
SHA-256: 814a2dcb2855626e58a7f408a0e8d7da729f1bcfcdbcb006f8230db659a3455d
font_03_sfnt_off000147d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D2 16572 bytes
SHA-256: acdd8f2d86d2a2c7e08afc53e6ba057fd8fe54a3c83d74bf555e6e8e70533c58

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