Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6423c9971e02b3…

MALICIOUS

PDF

82.6 KB Created: 2021-08-26 03:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b9b826a052b8aefdd29a3d1919089b1 SHA-1: 368fb931d33dd43acb263144a319914a6124e58a SHA-256: 7d6423c9971e02b3552a6f164db86b28b7e8d3702903eeeb247921417a7c523c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely intent to host phishing pages or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://catamma.ru/uplcv?utm_term=how+to+use+could+and+would+in+a+sentence PDF link annotation
    • https://hrmconsulting.biz/upload/files/pazabalefimovaz.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/72603876754.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f49ad19c2900afac2de716f3d2750ac/55797834599.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/nubezavux.pdfIn PDF document text
    • http://fedoro.ru/upload/file/zuzozavezozabe.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/16979977247.pdfIn PDF document text
    • https://tavio.ru/files/file/bitawoda.pdfIn PDF document text
    • http://prosquash.by/data/muwukolosaporujananaxezo.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/kujowogiwozazagunij.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/78233920689.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/mimofux.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/biposafonijisi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607965bd3d6dd---78181647640.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/56324523182.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/gotunasefugetivonizupavux.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/pi78dkdjfoo89g62748rhtjc37/limanekozotititeduluwug.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/19365175766.pdfIn PDF document text
    • http://odumakus.com/uploads/files/17882261669.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/finupiparikalodativ.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c289c96fcd5---981778631.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/30224435946.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/73653095343.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ec4b98ef12---velavejixabakufujon.pdfIn PDF document text
    • https://renault-service.com/userfiles/12602257019.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16105b0bd5c087---13121399280.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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 17076 bytes
SHA-256: 61c2abf0c201b2ddaa94ce56f16ab915cc17658bb8abd10c9d6bdc936f7d90fe
font_01_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 10440 bytes
SHA-256: 2028d4a8ca49e6ef3e0de59b911489b4dc91e1a0cde50eedfab115db13339bfd
font_02_sfnt_off00012405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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