Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63a3d01d2da78f6…

MALICIOUS

PDF

78.2 KB Created: 2021-10-01 16:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf06b45b00335a4ea4dc1e1ccf9f2501 SHA-1: 48c978b0c2090a2b4810c2490416400901ee1c12 SHA-256: f63a3d01d2da78f6db4ac8bcdb064a2ee89700dfc373495aec4424822a204ca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gizaviation.com/uploads/files/febazinez.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161314c84bcdd8---95071979801.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/sevogixuziz.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346e133d56b---47521023231.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/944561776b9f7a853e792818c0827556/92948134380.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/40583214340.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/solenob.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/wojubesidulotusasudef.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/vopoputekev.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/givuwebizosalerenebujug.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/39912855873.pdfIn PDF document text
    • https://areicon.com/images/file/72283919311.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/roravonolujisib.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/41177926977.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/juniberu.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/notikawa.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971c76a0fe---36364940437.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/mawarakemizuwebibazarir.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/5133416861.pdfIn PDF document text
    • https://magatek.com/documents/file/moxanumutiwig.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/77314321753.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/39335963173.pdfIn PDF document text
    • http://medica-brno.com/files/8046921084.pdfIn PDF document text
    • http://portableandcool.com/files/files/xobigolutoxivufabuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=half+life+2+apk+androidPDF 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_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 21268 bytes
SHA-256: 6157e36afbffbf83b61125d0f505b6f11da96d239bcc071e28bdc2005333e46e
font_01_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 10428 bytes
SHA-256: 6ff7f96495b792eb4d1f1f3f951b334b6cea1b1b8dfd53912cfab2792c45fd8b
font_02_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1