Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe68b9ee0aac6725…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 12:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4bb7ba9d057f6283843f73d9479d3421 SHA-1: 255e61cd02008f9566505b6da7030dc954312dd9 SHA-256: fe68b9ee0aac67250c0ac2adcc799d0e7c3d515e57700529271486bd1df2a52d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm or phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech-support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://wastran.ru/uplcv?utm_term=kinemaster+template+hd+video+download PDF link annotation
    • http://leicesterbiketec.com/userfiles/file/timusuza.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/24621722735.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/gakazesekezabawiwibozak.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/mamixa.pdfIn PDF document text
    • http://agilesolutions.in/uploads/zedigodinatuwoluvevejeg.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/mekaf.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/cjsos2sst3a1427v2h77082kjf/jomenadut.pdfIn PDF document text
    • http://18554080.com/userfiles/file/81043527833.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210924_476E30FB39DEE008.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/96198692680.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/bakosalabetegasutewivozi.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/ruremifipekov.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/lisegepijakatu.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/40995809027.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/24328046983.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/lupajemilomeludipedowem.pdfIn PDF document text
    • http://goodmax.ru/i/files/10638368279.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/navokapo.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/74482715520.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/powelojexa.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/27035254292.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd0adaa1f7---pepevodemidofesuguna.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6485804c0c0b7376bdff11d4438358bf/rokonunatu.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/80872205144.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/77991390577.pdfIn PDF document text
    • 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_off0000b080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB080 10800 bytes
SHA-256: 2d8d4835a2c01e166302614baa9b981c64f398059cd28b7464a942fa516589e8
font_01_sfnt_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 15016 bytes
SHA-256: f696403f077d1dd73c641aa6a24348b51773ea56d01796952dda84c04b973bf2
font_02_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1