Malicious PDF — malware analysis report

Static analysis result for SHA-256 1369dccabd2f7a3d…

MALICIOUS

PDF

192.9 KB Created: 2021-06-28 10:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8c393b4767ac293f1ad62cc52936e705 SHA-1: 0f046d5a64feae4cf1e7add1e010d469455da514 SHA-256: 1369dccabd2f7a3d89cd61a204fcd80724183ca7e47494144b6b128f68e3e621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely for phishing or distributing further malware, leveraging compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9694

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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb09abb9fec---85069904937.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gbc0cn7ltnks1da3nvaabdjnjj/7321721905.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f2923491b62d5170404012f1d54be060/56141802359.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/vamekoxaleramukev.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/8792252939.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/gejinudumugatotenot.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/014459ddc7065eb6d4542993e34153ee/90251220773.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/gizalepixiwujitun.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c09842d0---tofujoba.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce150f68345---62887160313.pdfIn PDF document text
    • https://robertbah.si/files/file/76909514011.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a1cd4d86---nunipazoxux.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0b6c0d023---fibokawumix.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c66b18f3ee2---1207767024.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/7dss649p360ck29fs0gstt9kr3/14360203728.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/rosizezotuso.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090cdebe01de---19449844793.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772f777c355---mudetemupazofasokaronur.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608038b3cea0b---deziv.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/tobezuf.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160947b5e247e0---zinibixuw.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a89f976127---ruzode.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/84349140251.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20be7d139---roretog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=planets+in+ascending+order+of+their+sizePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25548 10816 bytes
SHA-256: b0662a36a266ef877961bd54f9c50efbfc9418da44c5a4be83fc4461c8203645
font_01_sfnt_off00026df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DF4 21816 bytes
SHA-256: c0dcbc49832e1f2ac3018c8661412bd5f437fafed5d10c85e20b82ae0fc2ef3e
font_02_sfnt_off00029732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF44 27716 bytes
SHA-256: df9942a8d81372685e6807dd29a450deef304c78adef26a64f9f431a0b8ca57f

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