Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d01f7f1fe63428…

MALICIOUS

PDF

86.3 KB Created: 2021-09-18 14:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b5a41d43d6e046ce6a59360dc9d28862 SHA-1: 3b1ce0c4e9acd76218e12963d928eab39207aee4 SHA-256: f3d01f7f1fe63428134609014dc9dc0c61ffdb8baa25a4e775d6c9ba02880e63
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=best+android+task+manager+2020 PDF link annotation
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/pemazewenebizida.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/69474622553.pdfIn PDF document text
    • http://profstil.az/userfiles/file/bewizexe.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613165f6d7235---88646140537.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/liwapesupesotet.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/wevaxodurikilolakavago.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95672341538.pdfIn PDF document text
    • http://regmac.net/userfiles/files/87194803022.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/663267379614018b988c06.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/zobakewewadugewugobaroz.pdfPDF link annotation
    • https://loyalangkorapartment.com/userfiles/file/wutowaruzamirowoxuzo.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/bilutet.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/b918d6182f3c3c7e3fb9048859be7ddb/93952152817.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/80840271298.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/70202515497.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140b91928582---wemonuzizevovipilamozu.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/29332140814.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/wejasavifebopuvunatuzap.pdfIn PDF document text
    • http://insei.eu/userfiles/files/11997864751.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f4747335---wofatipip.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/gasimavenix.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410b0c52e97---68008249072.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/pitokijavorar.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_off0000ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 10932 bytes
SHA-256: b41cf48ab79ae3cd268e3dccc38de623dae6c47736780fa5e3d4ec97eddee8fb
font_01_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 17736 bytes
SHA-256: 9ede011c4ef25abaa1e51f75340d5e64207fbe2188e63a32e269cbc79f761e69
font_02_sfnt_off0001337d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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