Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b84d3bdba52cd9…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 18:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c6593dd83f722e2e578f6d44a5cb09f0 SHA-1: edbf9fff1a3721ec3236730fd8ce18640b5b093f SHA-256: c9b84d3bdba52cd9b10f9a2cd0c8f1c13de11f8bfd6c585766af31953dde7605
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=ugc+net+forensic+science+book+pdf+download PDF link annotation
    • https://agrimal.pl/userfiles/file/57718932067.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e626e81ec7b---25123720712.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/418d05cf312f75b45b0de5652f6c041b/wefew.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/muzovosedil.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/36831135619.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/nomezugotovefisoranu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/kedeni.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/tafewenajawetuxan.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be452cdabfc---jolawi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788157d8c4c---gigewabavupabelewarur.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/xamarusozizidoka.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/71709628027.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/18597325063.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/pufodeduvufudobawo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc2302d24---58698816726.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/sosedenaxodonisoj.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/zamajibepirujebexibel.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/99922222109.pdfIn PDF document text
    • http://veivel.com/userfiles/file/mijojexazewisosolapepekos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f692a0306---60612677360.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/8433860242.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/puwawenukarijujoxemebemil.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161217c68a971d---41307957174.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/kimol.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/7132173186.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_off0000c1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 11120 bytes
SHA-256: b4e3d6645004ce5dd30f3f01ed7b517b040796bfd53c5b0e0a363b760b4f080b
font_02_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 16984 bytes
SHA-256: 1fa67c9d912571deb6edb5775916bdf17c855a6799db1b3a9c938e5c5aba876c

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