Malicious PDF — malware analysis report

Static analysis result for SHA-256 e249160a60a5f5ef…

MALICIOUS

PDF

86.9 KB Created: 2021-08-02 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58edf48683ac9d4c6cbdf9c16dd2b145 SHA-1: 6837712a8d626bae0559d756e346147963ace7f5 SHA-256: e249160a60a5f5efac0f35c56eeaf89907a0fff4b254bec2c095d4aa7b3d2d9e
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://walnutcreekguide.com/wysiwygfiles/file/vuberulo.pdf In PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/78707074336.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/dawazoxajifotukowut.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ed2d62ac5694e9e19045fececde954d5/ferutolulutoseguxizera.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vurojetamejekenelegadozu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d4664a8c3---dorekiza.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/35840456486.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/kivemakemupepunila.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/54133445126.pdfIn PDF document text
    • https://parkettworld.com/upload/files/junubizovure.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ebbba0e5---64177213138.pdfIn PDF document text
    • https://basisnomor.com/contents//files/79017087555.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2301cde1---17645569181.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/d3gtv8qdnaock65q8su07h4nm5/galuwupivoroliw.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/wibutanarerewidipo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e5p3c7ab15nmlgh02cd03con40/xefibomemixiborinedine.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/pemufadadaxerisenelud.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/fagiposumap.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/devofexukunevoxokarujob.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/271534532644.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/loforikemidigefowedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+oyun+club+gta+san+andreas+full+indirPDF 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_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 18828 bytes
SHA-256: 93c117786ab89ef85b475dfa6f41341154a4a15a73b182caf062783bc8efbc8f
font_01_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13250 10984 bytes
SHA-256: 02bb10c0811abf0b1ced564f2b9d186299081968236fb05f3642c001ad14768e

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