Malicious PDF — malware analysis report

Static analysis result for SHA-256 db81291e98dc61dd…

MALICIOUS

PDF

96.5 KB Created: 2021-07-14 03:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6a216093c4b1e4f60d723dfb4c713c59 SHA-1: 06133d945d0bff45333ab5b5fb0bad08019707d6 SHA-256: db81291e98dc61ddd2c213d4741a0c1768ab31699431a495bee266b39b1ef593
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f90e17a6b---jijubiwodokitumol.pdf In PDF document text
    • http://thietbiotovn.com/Images_upload/files/wipofe.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/058ef1ab932b51d82a2093d083704878/15773802031.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/74282817887.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/fogus.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/lekijanujam.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/nujite.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/46dd8f7bd75cb7ef4f8a0c276dd06e84/rikusalixukawo.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/92273570577.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ift0ouo7vsmoi6nskksmjcqqi4/sofikinimofoxepolutejugi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/75ed714b1e0b8862fb7963838262e30f/vineni.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8f14ahtesm6psiq21boj269030/vokapofake.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f36088f7c---41657168914.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccac3c593a---xutod.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/1314993660.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aviveropedujokanifux.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/5288cb9b42d2fe44a64b78bae9c12251/pewoxixevolitiro.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a08761425---48041314989.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/34385268602.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ad162207---xuvabebiresexipisut.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ff0259e5---tokasiz.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/76ad415aed8645561234d4f1ed8e36ab/zogovixevojejojufutux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chinese+miracle+softwarePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000134fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x134FB 21308 bytes
SHA-256: 8b1a0eeaf67522f5bde51a90145235420708876c48f8fe0cd7fe724e8556814b
font_00_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16300 bytes
SHA-256: 6ad6a97a8340103bd5bbb379809c760afea3846a52e2f41c212478ed477d72a9
font_01_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 10716 bytes
SHA-256: 59f1986f00b162f49e1957e95c01b188fee1310a877f61995635bc5bf778b49e
font_03_sfnt_off000159fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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