Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84d77ed7709d39b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 15:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1c4a41f0fd0eff3cbd7778a89f365169 SHA-1: 1b252cf1cf221cfed9d9129a30c679184019893b SHA-256: c84d77ed7709d39b978a1dccb661c329efa5cd0a28774bce3e08e06c31003131
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9963

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 http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/la4l3h8jblfeqebns4bfo1eqh2/49091907504.pdf In PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/cd2adb87378fea38ce804c33f428c4b3/75985547279.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/de5de2f0f42eab7209a81279bd204ca1/fuxedixefad.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/54793302735.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/39555044340.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/81336887301.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/92538474369.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/96980700695.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b05e2989bfa04a00ac5c33ea0baaf1ea/91423118528.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/75429578760.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6907a4103---22782888240.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/xewojovofiwuzudotatelopu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073f54d3ed9f---32951779183.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2348cc951---jadudalobuxa.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/7057675268.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b077c446367---pobapikonasumir.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/13573831786.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fbca05063a2---lesop.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nadesaturevuwopadaretu.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/c395fbcd15e150318745b875d12a11a6/baxesujafowexoferederogu.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/93562913158.pdfIn PDF document text
    • http://mesamiesdallas.org/clients/e/ee/ee8f1390623de39be1ac2b47a321719d/File/wegutole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=footballs+coming+home+piano+sheet+music+pdfPDF 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_off0000bd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD19 11184 bytes
SHA-256: 56b46a5672543e12c0453657d875f11ed707c24dab2f591cd9117c3355f4584f
font_01_sfnt_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 17200 bytes
SHA-256: ee9639395e4c5e76575e6cc9308661b4e45031bb38bffddcc619927809fa1ae5
font_02_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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