Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05a625bf0a87c99…

MALICIOUS

PDF

83.0 KB Created: 2021-08-15 14:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3ccc7ae56bc4aa814cd52b72ce08f35 SHA-1: 6110d98c8c3e50ff89599fb1d67f5ace08df95a3 SHA-256: c05a625bf0a87c9989f95f9aa500ca67bbb04383c2400755b9bf34b4fde2ba80
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing and trojan delivery attempt. The 'ClickFix' heuristic indicates social engineering tactics, instructing users to execute commands, likely to download and run a secondary payload. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pistant.ru/uplcv?utm_term=windows+10+version+1903+-+error+0x800f0900 PDF link annotation
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070c88d84e39---xovulevibujivitaradegona.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/75651630824.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4mgum05k63tvcfonipvpv0hqpg/92575811642.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609280cf90e88---ritutim.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/demod.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/27751918924.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f48c97d0c---37013602321.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/telepumimem.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/73948624683.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68d8b7695---50084457031.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bfe2d3b0d---wazus.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/57683564007.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/84979229328.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/90930993574.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b160da19733---narexevotanad.pdfIn PDF document text
    • http://xn--b3ct0dc9bc4a4g.com/userfiles/files/gunaxuwefa.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/poxeriruvikerekavose.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/pesefodamezet.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q49edigttiiud8rgkf4m7eijo4/22831082239.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df07d74dd9c---lezinoxokalovokominu.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076142a7c80b---50432198685.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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 17300 bytes
SHA-256: 0127589cb628036fb1f477ef859f13109e945740287db0557103138455837790
font_01_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 11044 bytes
SHA-256: 9406a31d94cd1acb7a501dd422d884e737f0e237b324944d3b98989e17e426d0

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