Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdf27ee71986d23…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 09:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2278aeff1ed2b4107543fb757bafd46 SHA-1: a966f5c4ec2bc6ab94052689f37a5c877a2ad055 SHA-256: 9fdf27ee71986d230ca84071176445ac229b49c9ce846fa43ec9990394e012c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 http://irfanmakina.com/depo/sayfaresim/file/robax.pdf In PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/vabijenup.pdfIn PDF document text
    • https://ccskin.com/geektic/files/xotag.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/200a315cfb10074c318ea47ab311725b/gizinep.pdfIn PDF document text
    • http://agrion.org/upload/fichier/95038819433.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090106080573499.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/31514394153.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/wigab.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/68036271205.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/18619170098.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/kubekupowudiraperokip.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/bumolorori.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/velanatejanozolavuwane.pdfIn PDF document text
    • http://kahasat.cz/data/file/41370431491.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/29756076315.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/toparesosu.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/ridufeperaregi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rk1n0da2nmn6rq5q79lar6ej24/tupekeduxumivo.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/24312964017.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/falozujijanawixunubi.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://dietaltop.com/userfiles/files/misezizunusofemu.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/ginegejutexodepawuduvukit.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ca3f1c17911b42e606c5b441a648eab7/7512619936.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifod.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1dbd43d42---vamawugififati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fancy+text+and+symbols+generatorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE22 22876 bytes
SHA-256: 4678f97cc273f7389c87f68abfed7c906af60505dccb358039c2084ed0397eb4
font_01_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 10956 bytes
SHA-256: 9824290ad80ff1583d7dc8b859b2498f5d05a6489489adccacb30522a9bcb251
font_03_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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