Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3a9a5d26dc9c45…

MALICIOUS

PDF

70.7 KB Created: 2021-06-20 16:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e21888b513356bc1e17b6f88fa1cbadc SHA-1: 29a4576a50c450df50f2da2a6e074b0a3d04630b SHA-256: bd3a9a5d26dc9c458f0e4d80f192608407886bcc937c1e94cd7e9e845fb25ff7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest it's designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=brownian+motion+excel PDF link annotation
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3526151c3b0d1a6fa4a0df302d4684ca/wexilelu.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/95272779700.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/kuwodufeza.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16051d471e---11561313433.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/67412060485.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30ecebe49---jovonagexurixasimategid.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41fde4329---sezewafipesagudimolep.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ca3848cf---wepopisu.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/refepagosek.pdfIn PDF document text
    • http://vhshf.de/File/46900890987.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160773da0477ac---96711770353.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850764a185a---85307934270.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/lemuvax.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/nezozotujimeti.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/32403248961.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/49f7f348653d9e8a4bd4620fbec29804/rorudote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://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_off0000c112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC112 4976 bytes
SHA-256: 57c2ffd2d7c240ae3324e420fb20bf9e829d43beae71635ac7a716d6d600e4b2
font_01_sfnt_off0000d1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 10864 bytes
SHA-256: abf271ac15a5510d11e0fbe25aafab79da7b9e2be3a6a11c0ebbfb3d208b1517
font_02_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 16132 bytes
SHA-256: cb440fb17ddf602a9f1e20fc5b27fb39fc82df3b2611bc5a5a33a2c898a8b8d8