Malicious PDF — malware analysis report

Static analysis result for SHA-256 115b4d22372b6a00…

MALICIOUS

PDF

75.1 KB Created: 2021-08-29 11:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a460326f1b52b9dd7b00a6b192362890 SHA-1: 47ab9319a915626ee45ba520c09f74c6d576c285 SHA-256: 115b4d22372b6a00dafa482b33a501d31225255d1b918e86dffd1511f76ef64a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=tom+and+jerry+movie+1993+full+movie PDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0b84ed850c143fdcc34126942b28c237/dixosivaje.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/biwafedifunegal.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/37183434827.pdfIn PDF document text
    • http://immopolignano.lu/images/xujivelawa.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/96740558876.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/59157581775.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/37943358505.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210531_184520.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/b11665fef93b7f64de25526f0a3a5bd7/97307658299.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd9677c03---kamatonozatudem.pdfIn PDF document text
    • https://goodline.by/userfiles/file/lomobefuzajiwi.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fb4c9406---jeriwuzew.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608566a3d6e9a---28426269258.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a12619dca7---figosaze.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/20169839849.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/tidazitefube.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb54180fd9a---10682640877.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/17283584211.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/be0475df00c56fa48d65b0e6f2ac3b20/26105644282.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/39082885381.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/kubojapikeve.pdfIn PDF document text
    • http://bptramptour.pl/files/file/80420544201.pdfIn PDF document text
    • http://hibertek.com/image/files/20210703_005652.pdfIn PDF document text
    • http://livilgirls.com/files/dozesadax.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_off0000bf7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7B 17472 bytes
SHA-256: 29f3289d72a3f452e7db03627268bda93804d1eb0302a2c1ff884b10b58aa67a
font_01_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 11016 bytes
SHA-256: 8174e4fa5f5b2df9c71ac8ce3fe6d857ead454e7b23f64a3cf65e4c4fe71f109

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