Malicious PDF — malware analysis report

Static analysis result for SHA-256 249bbdd011ee3266…

MALICIOUS

PDF

115.8 KB Created: 2021-06-28 08:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 90964f1f6a1a75f56778f584837df4f0 SHA-1: 3980820de596db5ba85a9aba9a832ea0aa03e134 SHA-256: 249bbdd011ee32664b3500da632ab9a25f4d51ae48e046b19527bfcd5d74deb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or SEO poisoning tactic to distribute malware. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=canon+mp620+access+point+manual PDF link annotation
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/p805tol0l27f7rmgbc4sldfstl/tufelaxorubabatarefena.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f82e894a---39541582520.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080317b2efd8---36814544897.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/13cfdddcd3004436692eb5e89064af33/96099960123.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b63f660453---zunimimudufepemi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/evrhqvn5l4n7vrrr2bbel5b2c6/julujudetolubow.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5c74b982---56823890306.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/lunuvosewomexeg.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1f60622ab26427d16d717102f8407fc6/fofope.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/tetazirusotuzi.pdfIn PDF document text
    • http://beiks.info/public/file/folusozakoj.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/wuxenuboduvexukabenejike.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0542daa9cd---89876384816.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5a495512d---pawaruzebufib.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/27834263650.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vkrf3jsnj82pvbv04vn83cjg1b/siguwosatefegatipirasi.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/7c88cadcf499924f8062d35de676ef5b/28837154951.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/6db93874d13dea724a5903bcd3830d86/2769976829.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/24bee65541ba9e764938c6dd8459d7af/62730816709.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/24610310950.pdfIn PDF document text
    • http://beiks.info/public/file/30584934207.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/reja3sl69p28as1g0md1p9qioq/jowirokuwan.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7635860e980b4da218dbe362d6db626f/bagenezosemum.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073c29aa43e5---jonolesosituvix.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_off000161ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161AC 10976 bytes
SHA-256: 3363922be91dadd24e8f83532e5655ea9b3f2e45eb040486a48051234c415dc1
font_01_sfnt_off00017b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B2C 17904 bytes
SHA-256: 458fe55b23bef7edfbd67cd1da20690933baab556ed9b13a2647887126f965d3
font_02_sfnt_off0001aa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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