Malicious PDF — malware analysis report

Static analysis result for SHA-256 71607e386580c400…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 06:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a22e6f68bec71c9b7ddae98f9f4a1bd3 SHA-1: e8b0498514f10274d17d9795ead5d9bc08f998d9 SHA-256: 71607e386580c40094b250d3a083c1f8e6f75043228a88cc91154d7e22e903c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely intended to redirect users to malicious sites. The ML classifier output of 0.996 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072be57f142a---11651726989.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/612b238cacf2e4eae5df7351f65e62e5/tedovusofezuf.pdfIn PDF document text
    • http://e-hematologica.com/users//file/gusopigofixufipo.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256020b136---tawimovulatukogefafitex.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/2958851387.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/29579332914.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c876d810d47---wenonukavetaduf.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jq8c6cusfpsga43h9btg550vo6/vobevafafopabikituseje.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/8fbcdd351e57b786e49b53e7f98988bd/nivobagikipajowojasug.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210827_32D421A83ABB7D8B.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b006bd8d9---xuzimolasal.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/talijim.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/36af5f0c34083107e36ff8707565c60a/28493469594.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17202984787.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090ff8c80d3e---70556084472.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8836a57150---41935774595.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/xogofuxebejakesanetab.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/73483620995.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c29a18bf321---38886549826.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/gudokewasa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16123cd9675d0b---21298634256.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/47719582835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+worde+%C3%A7evirme+program%C4%B1+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_off0000c21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA36 10928 bytes
SHA-256: 3d77d7271706b87b7f99d5847fcd92c523753da8deb476f50f90c882674b0048
font_02_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 17972 bytes
SHA-256: f7cd6cf0ac8948a0b243672eed80b0b635447ecc2378fa1b6847b759bf1266c9

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