Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba91f85a7a2f1cc…

MALICIOUS

PDF

100.2 KB Created: 2021-08-06 15:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7a37b1b6f9cf498f02ddcf190a06b72a SHA-1: 0315cb39acaadc0c5148ed26cfc01e77ed037a26 SHA-256: 7ba91f85a7a2f1ccc0ffc2006aedaada34eab1fd82e681a76f1e0111ce403fd4
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 0.9977

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 https://crewmak.ru/uplcv?utm_term=leaf+collection+company+near+me PDF link annotation
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbce6dcec1---boguxuruwakukuwepe.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ollp9ltok8vhe07ldvmd4425jr/muzimumogopuzefudapuviwif.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xazejotonemaz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a5d89548---kizodumomogevawawuvafo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/zexonusugejikokurupalitot.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/48840796413.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/xumoditaliveran.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/81285854760.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/minofivugafoladepowovur.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7af447facf---93746618923.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/68480523602.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/97690445400.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a55d86d8e4---koxopikebifabuzada.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/20838229524.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/62497333918.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/62480717224.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160971f3201da3---manusuwoxi.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/batugi.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/3655685401.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba41bc1a303---36313249732.pdfIn PDF document text
    • http://absigorta.com/E/file/46442718787.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c163e0b3f71---menaloragiretopige.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b736cdcf55---nivokujasifasimeb.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4kpdd1bope9csu7291a653mpv1/95102279836.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c12c7509c2---31375368038.pdfIn 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://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_off00010ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA4 10544 bytes
SHA-256: 7384cac321e58ac5c7cb0ef6fc75f78bfc8a07f4187f1cd04d0e87e224d04e21
font_01_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 18112 bytes
SHA-256: e519587656fa0a9d22f99c2c53a3b7294d2f2f3927c5b3c297cee2b8ef65bda3
font_02_sfnt_off00015390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15390 16244 bytes
SHA-256: e6f4279f7f3abd0cb0176897ac636ade086287e2cb38c72215d5d005005fc864
font_03_sfnt_off00016997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16997 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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