Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1903c4ec20cdfe…

MALICIOUS

PDF

83.5 KB Created: 2021-07-14 06:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f882eceed67ca1aee1816a24cbea87f SHA-1: b81ab4f3aa6fc9ed50521c4faa26cd95ca2e5427 SHA-256: 9b1903c4ec20cdfed10e9c92e657f5681cc0bd3083933d769133de0927d4902c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs suggest potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d44d8f95a1b35e15177a3bdd572cc6a2/60728662936.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebe6817c8c---numodugonuvob.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/78098299027.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fdf5af6b8b9aa8118ffc167e770585c3/73020128427.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608161bfca158---26386834137.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/adb2f90fd06cfb8329c2feb224c6e6b8/tarakivifafedonuwine.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/60534443611.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608a71c6ec306---87201097266.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d07c1fabe---31521761036.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9802e724---7170513733.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b10b2779---75520130345.pdf
    • https://marosme.ro/hirek/file/90384911258.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608654e77ac8b---tikuvugusuwi.pdf
    • http://agcslohian.com/userfiles/file/fomutomaludig.pdf
    • http://tt-ural.su/admin/ckfinder/userfiles/files/nofaxuratep.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/426f50cd2eb58affc3944f4c28086b33/43611000738.pdf
    • https://ecoretras.com/file/38622044880.pdf
    • http://otvorene-srdce.sk/userfiles/file/21609539502.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a598adaccf9---55517614817.pdf
    • http://mastersequipments.com/ckfinder/userfiles/files/58060438678.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/078fb484402e281abdd2138ad613e8da/19674523618.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2d79b66a---97947810398.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e25d47e0d44---30720688889.pdf
    • http://beming.com/ressource/site-image/files/bifejulugu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=experimental+physical+chemistry
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE34E 16792 bytes
font_01_sfnt_off0000fb60.bin
f34d0b80ca041d8d5727ceba4cb551e03b5c8638a541a17ddfe5bddc7908e0a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 17308 bytes
font_02_sfnt_off00012848.bin
a9d39c9b171591327ca33915deadac833672fca327d19c87ed63a4137f21f1c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 10716 bytes