Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c925f317aa9bacf…

MALICIOUS

PDF

71.1 KB Created: 2021-10-03 01:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 432f3ed61da0945c95a4b57507c3d080 SHA-1: 29e0d1a9908002921cc86e8f2fd3946780cff041 SHA-256: 6c925f317aa9bacf1242b9bf4e883564ebe5af087a6e1b239998858ac8701323
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable binary data.

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 http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16146576d39d99---xapipug.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161376f1451e4e---nesulunokizidesepukideru.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/saboratobiki.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ccb757052802f4cfaba04c4a87ec58a8/ketedipoxipemarogovid.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/fanidifupafa.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/gevedorud.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/peguguligojolukapekeri.pdfIn PDF document text
    • https://possamaiferramenta.it/uploads/file/29802843420.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/63682971083.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615870fc33b5f---67366923005.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/51644741842.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/95913290699.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/nozobigitigu.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/ravated.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/28250956347.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/70702398769.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/mugewugepujixekuvoto.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/55606176371.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xokemigojolopinaripa.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/96961067832.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fd76466f---xitasanos.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/94438763059.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/96842717815.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/77628546004.pdfIn PDF document text
    • https://sergiomauri.com/images/file/mixomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=early+morning+affirmationsPDF 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_off0000b518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB518 16352 bytes
SHA-256: 42e1d285397a119f3c38c293b4797128aa104524555566dd73175860e44b3aa7
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 10520 bytes
SHA-256: 6d9707e2cc5ea4d9b7c08ab5df7e6c4c73848480d638b05fe7c1a2c606ad7a49
font_02_sfnt_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1