Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c1e9761409d884…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 07:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9641059e042aebe293654f793b068699 SHA-1: 2717cbab78eb6fade713507f22737fbb22623430 SHA-256: 31c1e9761409d8844702740e6f5ffacc1a64fed4b3c23015076630f5b683a363
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple external URIs pointing to potentially compromised WordPress upload storage and other disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=call+recording+android+11
    • http://xn--2-140-swe8h.xn--p1ai/files/xoxawuvesorizavigagat.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/80809882342.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/23e957474e539d794e3bfbc3058c990d/31773359355.pdf
    • https://ihotel2b.com/upfiles/editor/files/33720088363.pdf
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/4742628524.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/relumuka.pdf
    • https://4wheelchile.cl/admin/uploads/file/5215176481.pdf
    • http://araratmebel.ru/img/file/vuzavuvale.pdf
    • https://yuvasarkar.org/userfiles/file/kibuzusomijexax.pdf
    • http://ecohort.com/userfiles/files/1936653551.pdf
    • https://stopserv.ru/files/file/16534032412.pdf
    • http://bukharageorgia.com/sites/default/files/file/rezujawabasizepovevi.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614087170ac43---31749898099.pdf
    • http://zdrowejaja.com/Upload/file/16816599105.pdf
    • https://wemservice.com/ckfinder/userfiles/files/52308409348.pdf
    • http://www.ujepites.hu/userfiles/files/89954008296.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8b32ee9f0---45734975340.pdf
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/38610206200.pdf
    • https://worldcastlive.com/userfiles/file/23590667526.pdf
    • http://warwick-ems.org/userfiles/file/vosofupibetufuluk.pdf
    • http://abacusnancy.com/userfiles/file/fepibilasifupufikoj.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/81237353071.pdf
    • 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_off0000b541.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB541 16792 bytes
font_01_sfnt_off0000cd53.bin
4a86f83220420ee20156020f95ca9def9f61b4a9364d3a49847955b247896ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD53 18528 bytes
font_02_sfnt_off0000fcb0.bin
f91c2d10bd641923edcf6a21e2b573ba501d61530def500b85396680db0ea977		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 10364 bytes

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