Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d943b9985a39775…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 07:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58bb77c46f5dbbf53f206197142095f8 SHA-1: d2187f27c960235424a46e54525f3967b879dd23 SHA-256: 6d943b9985a39775395ad9ce3315266de03dd92162b4229b89ca1703ebb3bdb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These elements suggest the document is designed to lure users to external sites, likely for phishing or to download further malware, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=the+visual+mba+pdf+download+free PDF link annotation
    • http://velapower.com/glwh/UploadFile/file/2021082318305073499.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/lutexamedogapegoviluv.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/77828729546.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/16860451500.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/lixifibamanu.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/28874809950.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/33647172768.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/6098923733.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1611cdc35e456f---posoriwovojanulakorojek.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/41568677957.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/5t4g2n374ad8ts2mfpf6nriubm/mukuzasaxevogedepanise.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/cb4368dc4012ca17c169c0a73908cc4c/wuxovupinodatasuk.pdfIn PDF document text
    • http://winso.tw/userfiles/file/puxevuxa.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/72109671786.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/20323084947.pdfIn PDF document text
    • http://julianina.dk/upload/file/17182282037.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43e36729b---japijobiponexuw.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15ddc54b8---tepaxuwupunekugun.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3c6cbfc4d4ae5141ded8d5c4bb5e79f1/63124366992.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ta18d4sjjj2c0vsaomorma9uu4/siwux.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/83415620317.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/rg89ukbrv7ge8erb3mt1b72kiq/fogizuseteniro.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/53606584426.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_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 11020 bytes
SHA-256: 85ed0198e263922321499e582384df0700ecc3db794f974e24bf94665c1ef899
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 18164 bytes
SHA-256: 4fda34fc2c465822871208d9a88991908dc0733f3fd54bf63fcf05652d16028c
font_02_sfnt_off000138d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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