Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3ea69fa3e1b59e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 09:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92b55eb63f0e6bcc5ef0bc17e3f4ec84 SHA-1: 172ab52f7ccf14b2b9cd331257d9d8a363fef19a SHA-256: 2b3ea69fa3e1b59e887b2751f3b2f19d54d897e5a2f2eaaaac18a2c6966d6514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=wirsbo+radiant+heating+design+manual PDF link annotation
    • http://perfekttorun.pl/pliki/zebedofi.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/gigaximonanuxur.pdfIn PDF document text
    • http://c-amc.com/upload/files/jajejuz.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/pemalojuw.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/nemiv.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607985f9416aa---30504406828.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ea3nbmr4tfs4n33h9aj0hvppt2/2560344150.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/16100960123.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/91884344793.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/27128091948.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/de987dbaaa5f9e342fc94b4fc30d9b47/jixolili.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/19587327072.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5koulqvgcm1658o92lkdb4au94/87138027765.pdfIn PDF document text
    • http://change-sexy.com/files/files/zonutefagojazu.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/tusepekilojatobak.pdfIn PDF document text
    • http://headrepublic.pl/images/files/43189133243.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/93366349688.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/fotofukuvujujagimow.pdfIn PDF document text
    • http://cpils.com/userfiles/file/58850997838.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ccbf26747---kaleg.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160751ea991976---77184773846.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7098a6b865---netumaru.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/wafokusesolaluku.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130f9f98c129---71268572910.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/84170085930.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 10928 bytes
SHA-256: 72a255fb83aed287924e11ff58e335275c266bcaad8271d09a1ffec4e3fbbf00
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 17200 bytes
SHA-256: b55077611ceb8b9b2becd15eb8727725e73551990ad26ae2995f51e210c77e48

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