Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f841566fc12f55…

MALICIOUS

PDF

75.3 KB Created: 2021-07-31 06:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3717e552cf4021319947525e4cc53aac SHA-1: 7e9abff5ff36d1363c93cefff7ec42f0732db7fd SHA-256: f5f841566fc12f5539c0d49a0a426f3f8f5511e46b176475b1b5533a44137b14
156 Risk Score

Malware Insights

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

The PDF sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb72a38b1---29020291157.pdf In PDF document text
    • http://sns-russia.ru/userfiles/file/49107398331.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/dea5hsaa97o6tn9f22m14v3hi6/81763329428.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/e3f7f3d160602e3088a9df5c0dde308f/89655154941.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/81713593299.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfebdd4b0b---gusolorazer.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/wutaxezobukepuwupez.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/92rfujeth6k1qchbrg2sfn46ku/ziboxox.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pigikivuvuloloxevopaxo.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/91231767531.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/21834841286.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098c9b045e6b---76496637059.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/15619777472.pdfIn PDF document text
    • https://phuquiland.com/upload/files/69451748286.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/kawumatadibelinajof.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41153083979.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/60729075951.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/27a4a98d6ddad1b138461bc242688d16/31502889116.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc1904451754413843589e9df45741c1/91620281036.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d3e0dace---72867917786.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/47612530297.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721025f00dc---kigiguxonozapivup.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/venikafaramasekup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+put+multiple+commands+in+one+command+block+bedrock+editionPDF 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_off0000c089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 17140 bytes
SHA-256: 5e0d9870c09445de26ead706d8645a8e5ff645f10ead90fdddaeb3447850bdb1
font_02_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 11084 bytes
SHA-256: 2075bb914d5fb46bea4bc002ea75cc332482b0b531b84397a77271dd94bd3566

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