Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2426193a142f5d7…

MALICIOUS

PDF

104.5 KB Created: 2021-09-05 21:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 391fe7a2a07739ad2f95833b2facd5dc SHA-1: d7c90695d14f4825e377a4f69c797b6177fb58ae SHA-256: b2426193a142f5d7cca19901e98111a66da22cd1462c731689b5ed4d470bc80e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the detection of a phishing trojan indicate a likely attempt to lure users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://autosaloncenter.com/uploads/file/6453657582.pdf In PDF document text
    • http://laduses.nl/image/file/loforelepukarubageri.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/20767064994.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/68763590963.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/fumaxejif.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/58854649675.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c457bd57607---buxamoxevofaneremalakil.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/28716419012.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pffnqs0q0p42mkc4bqma7mtlba/93747007188.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/k0a4aqrim3endiqm5dkttn707l/disamukemusi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/089600d4076974192ed6d29a667dbaa1/rutetuzezizojulir.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/36913706301.pdfIn PDF document text
    • https://rivnerun.club/images/files/zisabuj.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/didufofovuxupapilizupi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2004f1c272---tuxamatud.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22767d6d73---96367550048.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210608032124.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/bunipozogubinuzeto.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210705064954.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/61p5bbfonmcjlelngd86fns7np/remexili.pdfIn PDF document text
    • https://soechi.id/userfiles/file/29316899894.pdfIn PDF document text
    • https://silga.ca/userfiles/file/bajisipeni.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beff60e89a0---42435041881.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c4ccbe55e3d2901c0184dd132ca27caa/40870236321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=year+3+time+worksheets+twinklPDF 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_off000130dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000148ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EE 18720 bytes
SHA-256: 08539a2b6503b4e153a7f238131e3c3c0022fdbe0e13f2fe848a3da47f365ad3
font_02_sfnt_off000179f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F6 10704 bytes
SHA-256: 1b7e3969063d3b9ff460e63a0d9ecb11aa9db7dbee76151f2955c60e9006d400

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