Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfd55a192496ffc…

MALICIOUS

PDF

71.4 KB Created: 2021-10-04 07:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c8cd2192dad60042b05086105db15dd SHA-1: 26726f4959bf72575b23e9498210590d3709c4be SHA-256: ebfd55a192496ffc2dd17af0b053e77eb5d2adeac59e24794e362aea1b7b82f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The 'SE_CALLBACK_LURE' heuristic suggests a callback phishing or tech-support scam pattern, indicating the document's content is designed to trick the user into interacting further. No scripts were extracted, but the presence of numerous external links points to a likely distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kolesnikov.pro/ckfinder/userfiles/files/xoratutejapazanidegari.pdf In PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/xuxemenarowikizagada.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615382dd9ab54---gekefujowe.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/23077895319.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8bd3ff25b8e43e10feeea6765c5e43da/gidovubukigizamujuditenal.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/busagefusuxegamom.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/46704916913.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a1f3c1d5f3---sifezuxinikibijimago.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nufudojumabipasetumaket.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/17755332698.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/47e72d934814f255f4da4cdfa32f060c/dudubiwifijatewi.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/zedonokekokugejuw.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/97151192956.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/10570512581.pdfIn PDF document text
    • http://dakov.hu/_user/file/56717512922.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/gevij.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/64245952135.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/risojigifezebekegideluxu.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/13048920609.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/nuririxaji.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7dcd3a36205c542f5819bb9dd73d08ce/15129590465.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/88202954191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=surveying+instruments+and+their+uses+with+pictures+pdfPDF 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_off0000b2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 11340 bytes
SHA-256: fa1e32440443a2ef02d434f2a5a60f869c24275c014fb582173f9ea28e75bec4
font_01_sfnt_off0000cd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD50 16372 bytes
SHA-256: fc8d92d386ae64e65232e823fcae817698b2fee4977f94fe685dd9a7c13a38ca
font_02_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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