Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1f531860bdc420…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 06:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93b081c76c7e046db6b15e4ed2bb663b SHA-1: d857a87ad355e2f167058dda46b9fa88061f8641 SHA-256: 6d1f531860bdc420f202dfc2fe175620f22ed73495efc6c15179d9e572b83c0c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wyslijpaczki.pl/app/webroot/files/userfiles/file/68510765022.pdf In PDF document text
    • https://yenhuy.vn/upload/files/wupofi.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/74080465401.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/96650544346.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/28397135761.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/4313440039.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/rodedelaxolupude.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/famexigemikeposejobeve.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161433c0a246d6---91665801668.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/27386473274.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/tavozulokar.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/jebowovo.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/46920731621.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/xuxodakazozujagurefutuwe.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fm2gqq41ne2ka5nc4b23sm5dh/63157774699.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/69222335540.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/bowedinopebegevab.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d303e31b1---64976185058.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/45009136190.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/rikigu.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/93725949510.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/60345342450.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/taxobaposatogudemidaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+ip+changer+vpn+mod+apkPDF 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_off0000c4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CE 17536 bytes
SHA-256: 198b558932c68ffad9654eb34ad5aa02b0474bab16a530a791aaa8e80bfdb734
font_01_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 10784 bytes
SHA-256: e821b4d74aa443038b278f36f0bd957d5bf4ba15b4e7d89a8615b4c37bf9a6d8
font_02_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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