Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d484b87ec183a7…

MALICIOUS

PDF

89.4 KB Created: 2021-06-25 20:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04a87f46d5482f69d46e2b3bb50ffc99 SHA-1: a45b8f571f2b8763cd7843db5dfbe6df592471df SHA-256: 51d484b87ec183a71a971788647bd01c14259d7a34d1f358176da56ee31f2621
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to compromised websites for further exploitation or credential harvesting. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=protective+tariff+of+1816
    • http://szymonadamczyk.pl/uploads/fck/file/23689657115.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e20baedd3---xolejovig.pdf
    • http://hodori247.com/uploads/files/nebefisozaxafozawaliwigoz.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c14b8b9f---tezuma.pdf
    • http://busankid.com/webfiles/board/file///xizaxa.pdf
    • https://glycocalyx.nl/userfiles/image/file/noduzebujujuveli.pdf
    • https://aucordechasse.fr/vosImages/62534612116.pdf
    • http://baaningdoi.com/file_media/file_image/file/relojulagewutukopugu.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160916ffc2f482---15554665625.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a96cbd2---wakudugakinu.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ba74d61f6---duwiviwibifodene.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7788396c---46745944748.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e618f2304f41bc0ec897fd0457e364da/20133465078.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/6fc86faa9c604b710c3f4a5d71fb4bea/91583191042.pdf
    • https://argumentua.com/i/file/gaxiwogotu.pdf
    • http://austria-ex.com/images/blog//file/wazevizanibapesetujesif.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aabe99e39---besasegexesanoruxexoj.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1979c7406---xilakidojolinulifedan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5e.bin
1897084371cbae49e09db56a0f0e6384d46e36493be32863a79359fd99d0ec12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 17612 bytes
font_01_sfnt_off00012877.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 16792 bytes
font_02_sfnt_off0001408e.bin
948b5c18ff83c3775facb884db014673b5c84f3818962d88092814c9a16ab587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1408E 10504 bytes

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