Malicious PDF — malware analysis report

Static analysis result for SHA-256 522976ab03b31e9d…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 21:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e1d39015248937d4ca75219ae8a03bcc SHA-1: d5d89179e7fb15c4f5a76d53a85d5199121a0806 SHA-256: 522976ab03b31e9d13470c95645e7db46006c867482cae4220d699eb4008fca2
216 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into providing recovery secrets or private keys. Multiple URLs point to compromised WordPress sites hosting similar PDF files, suggesting a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6155d9eb---10418547848.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804dbbab0da---13321483424.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ab48e9d95807622b8250657c6d4ded56/madamarepejopiwef.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/v0pqse7tk9h90fk98f5esubth4/94755010279.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/86388530327.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/rigazila.pdfIn PDF document text
    • http://hrudolf.com/userfiles/63453028149.pdfIn PDF document text
    • https://fallsplat.se/file/83041557111.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c091e3a3da762ca0417eeeaf0f29b42e/13376522100.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/suzovelugalemibigubodebu.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ukpjnojtf5i5g1igrp63shlvo3/1606679251.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d34620a3c8357e2a8aa6a8c13e01bf78/9169821148.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b086e7344---sefano.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430094539159497.pdfIn PDF document text
    • http://24cvety.ru/upload/files/sobafagudu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ddee391fa7f3c59a712cb152d3cf63d8/48092911081.pdfIn PDF document text
    • http://dienmaybaongoc.com/ckfinder/userfiles/files/vijeranovonexatunubitezo.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/weduloganafokonos.pdfIn PDF document text
    • http://promador.pl/userfiles/file/jakuras.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c20659d004---19028887548.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216191019426211.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ab7d2f3b5ba69e97e7dd868aa77bbb87/ruvurogekosepiv.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/nobugas.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5783104a9---5261306495.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/53595920140.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ec909c33d3f7c23fae6295cc1b0e4ce1/10809248563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=confusion+in+englishPDF link annotation
    • 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_off0000eca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 16892 bytes
SHA-256: e0c54b2ef1dff51320ccda3fc182ff3bf00c59af283fd63d6a3f1673804130fb
font_01_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 10264 bytes
SHA-256: b116d88b46ce3ce84141bd38a949864f1735ee84d63b050d8f5b8be906f05101