Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f8bfccb4852560…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 01:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df57b1477e3b9adb24edb280e0d2e2d0 SHA-1: fa584ca4b1f54be8f4f3e91c760d856fd8707d6b SHA-256: a9f8bfccb4852560cf24df8ad3ff8bcd0fcff51005e80109599f9c2ac6339737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to phishing pages or download further malware, aligning with the characteristics of a malicious document used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=class+management+styles+pdf PDF link annotation
    • http://tropo-design.com/ckfinder/userfiles/files/73669632611.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607544b26ebb5---72765479781.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d10747bbf4---81366729692.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/dosozopesi.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0acf358d2358198620896dae317ddc4f/rafusirebakajogamogowexum.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/98523053925.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb270d6e8e---xilulubapivegas.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fda2c50b8---tejizemorewisaragofuwulul.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160790f97798a2---xuwiferiwosifoxubobiba.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/laq4dni9ufr8li5i0bhsdj0j71/kotulofuvi.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c57ecdfe---96151135163.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609134162b433---94603793707.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e439cad1dcd---fixigevuzenumavipegiboz.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/jowumunetozimizotarimor.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dfc189971---37606551115.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/fukizurijawoli.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0db47f5965ae71608dbd6afe6ec60128/74523262772.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/xugaleviliminitik.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc9a3a597---mulilabumogodujejira.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/40845856327.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b61c07adfca26778c2cd6af28f5bc14f/18397459604.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/63467559011.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/34566486841.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_off0000b8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F9 15092 bytes
SHA-256: 51a9291da1c013914ae412ea561dad1e9d4b7d4fc1ed84de57a386d16eef38a4
font_02_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10672 bytes
SHA-256: 377404b654090c04f8a6c209b9c68ec23e0f0d46133fe0d9c972349247148be5

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