Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6948ae49411ffad…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 07:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d78871b8a4321406e81790a1d2b96e6d SHA-1: 591fdc222f29a6d88eeccaeb6b958c204d680dea SHA-256: f6948ae49411ffad200a96c6fed45f3ad0ebd0c58d09cc940e429a52e67048be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The presence of these links suggests an intent to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is being leveraged to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=thop+tv+live+cricket+tricksndtips PDF link annotation
    • http://studiofapas.it/userfiles/files/wifesomorozose.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/fogipezegusoloset.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/66711219519.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fe3824e9c---melolonaka.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4c0237e78---52671715502.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/jakebiru.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6449cce4f---81109645526.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/51101753544.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/71972597803.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/23425292121.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/lugomewaxidamiwevesusix.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/19338442928.pdfIn PDF document text
    • http://adveotec.com/img/file/53627783814.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/704002884.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/51126640300.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481f91befb2---faxetulidudipe.pdfIn PDF document text
    • http://mp-journal.com/media/file/5253654525.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/jovenatexa.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/95448897504.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/dusamivudesumuf.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/tawebixanelan.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/61486232514.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vudovuli.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/siseveb.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/79126551930.pdfIn PDF document text
    • https://olterus.com/contents/files/towovagewogukoj.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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 10568 bytes
SHA-256: 5b2715d6a8fe93c8287b80ceb274e58112ab8d662516d7fd21164b1be9ea6067
font_01_sfnt_off0000ca0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 16088 bytes
SHA-256: 8e3e7a665b4d0f3b68f4dc0aa833ea1cf0abf44f23df9d4ecd3f45d20d889374

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