Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cefd1f5319d2935…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 23:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7892bd58a3d1c7adaa2752865d0fd89 SHA-1: e7b5dbe46371f78e116d4899bf014ec6132e374e SHA-256: 9cefd1f5319d2935274fe81407a66afd5c40232716b894e5fc9b395f49ea8e72
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/hpg6kjkj60942mlv5amb6bfde9/44349562968.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b33426def---lojenoviferuzureri.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610082220799d---48788603837.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/semosixezudekafave.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/49289999744.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/kumojetelopader.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608620ef277ae---towufuvuwetuna.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/3694893508.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/22e2c3b456af76e20b909477c7f0b484/pexugazipol.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/28493e165a878948b63aa47b9cc812f7/fapubugofaxide.pdfIn PDF document text
    • https://baglab.pl/galeria/file/74881380012.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/72841500544.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/dutiv.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc4c98978---domifum.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/83763111031.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/e2900iegcnkamk8ueskol4htki/sutuxozavule.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/819331839.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/89956638177.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/lejoxomanuxujufojor.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097eb49599a6---69857175598.pdfIn PDF document text
    • http://protok.pro/upload/files/zajiwamadakapirevuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=battery+series+connection+pdfPDF 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_off0000cfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAA 16300 bytes
SHA-256: 6c024cb0aef8cd8fbbd0b5a3dbe9505cf2d95bb6a720828733bb47a8a3fe21eb
font_01_sfnt_off0000fa1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1C 10736 bytes
SHA-256: 32be198f7edba35686eda19f65dd8162107e0d4c5e3f236786bf07be7d85c452
font_02_sfnt_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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