Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ef3976cfeeebdf…

MALICIOUS

PDF

99.3 KB Created: 2021-09-05 05:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e461fca76496e5fa10ce51c268a46863 SHA-1: f24b9b473c0c2225d1a59a5415c133c2f459a5ca SHA-256: 96ef3976cfeeebdfac21bfe892588736c2523a09c8515880a816acb9e000ff5f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users to phishing pages or download further malware. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://didopack.com/files/68121105497.pdf In PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/danedebibulem.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/6093803de12c764641de32f5cead8f1b/pikagepe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bb0e0058d---25051196934.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210622_AF48F82C768872F2.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i2ed50tofmbd772p62idvnemr0/rorizejerod.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cb6a72cd---marom.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30e3b23d---narutometepumo.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/zofaranana.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/rpvqe1cs7qek2255n53rtkn7s3/58886033824.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/68328880425.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/92877722843.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/nexilajowidubaxuzotoga.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sgnid9c4a37td2e0591spuc7qs/rezazotodazeguvesuna.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37dfd6f561---zajej.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/ddc8b406e0c474dc611809508c058817/896679333.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161842842.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/selaberelezev.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o2r6dhioq1hsumtb3lnra564bs/fopevo.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/67708185942.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/67178947500.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/valovapazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=stir+and+pdfs+mild+hyperintense+signalPDF 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_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 11016 bytes
SHA-256: 53a8929c0255741543b96968de34fe15897438249ddeb8a4ea84ceaee3e55019
font_01_sfnt_off0001396c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 17784 bytes
SHA-256: 338fd281344eb9a4a829db980e5e3e5a97bd87c928ebd18aff72cb5e041bc07c
font_02_sfnt_off0001672c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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