Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a37ebd110670541…

MALICIOUS

PDF

94.7 KB Created: 2021-08-03 04:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd8001cd88e376b52646daf8bc1fab75 SHA-1: d8ce671537e29a60667a492fdcc8455d23e79b2c SHA-256: 3a37ebd110670541ee5e17166cace2a4718115c97331611fca61e3b4a92a79f5
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 Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of numerous external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ketchas.ru/uplcv?utm_term=tcs+aptitude+questions+answers+pdf+free+download PDF link annotation
    • http://nomorecpapmachine.com/userfiles/files/kijurajizagofej.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/a2db2a9422bd25b7c3e87332f0a78926/rewejuvapifividejo.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/juzewojazi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/05be9ff0d1c28e1e2aa9fc266b4324a8/vonamagujeti.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa68e26053---9858310253.pdfIn PDF document text
    • https://motacademy.it/file/wisisod.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80db50bd39---gigexivaxejivu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3848510a2---xeluvera.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/piwigemabe.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4267e289db33a2881e6cad8023e361a2/gokatitakidofuk.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/2351809899.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/64792584290.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/59534015245.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9ec00a662890baa8b5a18cbd2cc47e35/50107162961.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/92341265656.pdfIn PDF document text
    • http://www.toptehnik.si/images/pazatewiwakozax.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/8961155811.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f237ad2944---47507172474.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160716db758d14---fogagixol.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/dce601dd8bad840667ea8688db000afc/62897062324.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b350c176352da5dec0139724cbfed052/92995411878.pdfIn PDF document text
    • http://ccshecea.org/upload/files/96938853282.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/86780307323.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_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 10908 bytes
SHA-256: 833aa6f641683ba3645b0d120c4d4161d40f184eac095d745b56d3773fd38232
font_01_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD8 17736 bytes
SHA-256: b81a206d73359145b20e766256df561acf41888bba8c550370e8f4db1f6851de

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