Malicious PDF — malware analysis report

Static analysis result for SHA-256 173ca86f6c26f3b2…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 08:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ba39730a2229405345b74e5128bd2cdd SHA-1: 6a79f94a7ba04850603874deb619c65e7487d519 SHA-256: 173ca86f6c26f3b2633e64f945051b693e8988542bc1888c42eebd7e2f8441d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF that functions as a link farm, directing users to various compromised websites. Several heuristics indicate it is a link farm on disposable hosting, with a high ML classifier score and ClamAV detection confirming maliciousness. The document body is heavily obfuscated, but the presence of numerous URLs suggests an attempt to direct users to malicious content, likely a phishing or malware download page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1ed25faa2142f2988773c2a935774fa6/runenoxo.pdf In PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6cbdae584afe073fbe73ac3675835787/nudowudinodonib.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/rewuwigemome.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/48141767419.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc50f8d208---82484922647.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba32189ff---gifiwisujededul.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/32230169239.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01fff2a1e---lusetivolazibefomumujowe.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/88866920735.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/30579454730.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e8c69ae76---68750612610.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/wanesotadi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52555d755---76601431033.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/jusisotozagubowolamiv.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/dc1813227a8e4f9208f3f164481a49c4/703683150.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/043b9b2bb2d803509c97838302474244/zebuwovasikuvikobarepon.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vobukiwarevetolare.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/486cd5221c5c43aa8a53ba29a2aecf07/62903442190.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2i0ed93c56n95isnamsbt0tsi0/17886619232.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adcd7148326---32349537326.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/bb03ace6d9b9509f8c8364506ec66e20/30307839253.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/64082874785.pdfIn PDF document text
    • https://eventspicer.com/ckfinder/userfiles/files/92239507202.pdfIn PDF document text
    • http://sdds.be/userfiles/file/49932011226.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a106fdfec8d6b0138453d77f2fdacdb0/besilibajemoke.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160805a8544073---3069891072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=constantly+feeling+nauseatedPDF 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://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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 16740 bytes
SHA-256: da72ee227c9a4303becc10fbf6ce58f29ad41adbb09397c9de51513a56cae53a
font_01_sfnt_off00012190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12190 10676 bytes
SHA-256: 08850d1dbb8a5ea6b025cd23cf754bf5f09e44044311e9b9d2d56024f5cb934d
font_02_sfnt_off00013a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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