Malicious PDF — malware analysis report

Static analysis result for SHA-256 7964bc5a8987caa5…

MALICIOUS

PDF

139.2 KB Created: 2021-06-20 07:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 879f57cace3b9e6b965454c001855585 SHA-1: a3ae5265f493d113cc2268a9c7b67246e5f0c28c SHA-256: 7964bc5a8987caa5eb3d94e13b7ac6fd9c4c8dff4ee4756a38387a1589c5c086
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-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://nhuaduongnhapkhauaz.info/upload/files/32158572659.pdf In PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079714dd2f9a---dexufegijaz.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/87579354535.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/fb2d7610e6dd04d63e43166e52630048/legeme.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098d96b998b0---ravazusubewuv.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ed47d5e9---84557517263.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ba90ddd2---kopoladubizonaxo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6g1nvebb5vi08dm6jli0evqp52/64221314424.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/dosuweka.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce1c832b60---kowesupogegi.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/79855808101.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/rinanapepisuwogotisuk.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a71e5f3dd135d1408da2c38da5db8864/vefepigojibibijinuzeke.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7197d39f0---28046119516.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01c312f335---39556416198.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/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+mob+psycho+100+season+2PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14465 53108 bytes
SHA-256: b89d168476d2f06196f5a0939669192466a6ab05e478bc1087d002bb53e6218c
font_01_sfnt_off0001e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E584 5624 bytes
SHA-256: 92f9da025e5b4f4b5d7742f50e0855f9aaad989401c47d5dcee415dce7b19d9e
font_02_sfnt_off0001f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F899 11844 bytes
SHA-256: 94242322c7837729def029752afe6b2616f8d4b37f9067b52e5b8d6429e4f0c2