Malicious PDF — malware analysis report

Static analysis result for SHA-256 7146d264fbdb39d3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-06 20:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62a9722c9599b4e4faa990761dc76181 SHA-1: c1839920fcb3b3772386ddbf82db56af6bccdd7c SHA-256: 7146d264fbdb39d30a5d814762b07cc7e92de54fee373e0eae114824c8a8ac84
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=the+big+short+inside+the+doomsday+machine+pdf PDF link annotation
    • http://nano-vip.com/ckfinder/userfiles/files/98750398725.pdfIn PDF document text
    • http://drironcat.com/images/file/75815006401.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/11801871573.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/2326fb8d832c8abc62647300a0471ae1/95950217262.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/5a2c9f5a0cc2a45f6682dfd0ef44cda5/puluminizekawoli.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/64942208923.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/7576053135.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210820052831.pdfIn PDF document text
    • http://philboyd.com/zopedepewenutaweruvej.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/58390812510.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/jidujageseru.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/wadedisatijotusitazotu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rjgbe6nkl79eh53emi5i9g60h4/nojopewudapefowiros.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/edc23757010b0b682065de3023ca92d4/69085685441.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/38494980633.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/41904218898.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/zawokitejomabe.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pp9bgcofish68p8qb7cir9hbu5/79137122589.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/babenonu.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/67179361060.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091bcbbba1ca---kalikoruxedunodumawenazik.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b736cdcf55---nivokujasifasimeb.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/folamemamubi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b4bcdb4c116a2d1688c605e83dde3462/dojuxujabifuwepusogidu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lozikapusagisisebedonoje.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_off0000c172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 11240 bytes
SHA-256: 73eaa61958d50fcde01930625dd65d93d276529dd37f1e0fc82a59e0251871ce
font_02_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 17084 bytes
SHA-256: a39c4314fcb4179e67a6cda59d3980933d8bee59d95aa51d33d89d64f487f90b

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