Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4394ce9b6b84924…

MALICIOUS

PDF

89.0 KB Created: 2021-07-02 02:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 81d0e7f91fc7d70cb57ef6850bb657a2 SHA-1: f60a55765823573052ab8f04f2a16d74319c3811 SHA-256: d4394ce9b6b849249e826b06a801f54d2fc535950d8536d479e92b45ea2eb6ed
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, indicated by numerous links to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of embedded URIs and the link farm structure point towards an attempt to redirect users to malicious content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=abandoned+towns+in+washington PDF link annotation
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adf8eba5822---kipuwisejobepefaw.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f3046744c99554aac4187ba7f04795df/60503989424.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/dabinaripe.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad999c55d3b---64414853692.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/zifubeda.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814ad59bc86---wafevamoxorok.pdfIn PDF document text
    • http://amandamaitland.com/images/file/faxexononumobad.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/qtb6un1cqbo703ubs9v1leusl1/13247057217.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8ab3b7843dd422c24973b4d9364c28ea/wozav.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d16c19ee43---19914573683.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/lawabuf.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/73993696792.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/mexifixinemezafulivof.pdfIn PDF document text
    • http://ashioke.com/images/library/File/zuzewejuxesudawunidodi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe11f74691---zinifafefebamovefog.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/boregiwuwuxexawowidiki.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a653fe5ae5a---67208530323.pdfIn PDF document text
    • http://fullx.net/files/kezisaxudajamaxewopin.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/cvn6chi7bbcpscc1fps5m2tedd/ketidujefiwurisot.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73baaf7e7---gokelumigadaxonin.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756b592b3d9---24366443476.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2383503d66---wowuwedawodorifazutir.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/45f2736e44ddef6844bf7b0bef9da4ff/musijogulufekowijam.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5674431850cc450f20e24b5c6b6610cd/weweletimamuxexanaluxan.pdfIn PDF document text
    • https://tangentemag.com/img/file/26365290373.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_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 17100 bytes
SHA-256: f3a7bd0f397adabd56ff50815bf49cb7aa4ee0dd2dcd0f743ebfb2e8d8aa9af2
font_01_sfnt_off000126b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC7 10588 bytes
SHA-256: 9781a3d7c14a37a84e1946b9cc202e3fb85db456e3ebe2d791ef8d36629c1e88

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