Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2b855a973e5e30…

MALICIOUS

PDF

116.2 KB Created: 2021-07-05 21:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9655c6bc5e2cb18686858b66ed28d5c SHA-1: 82e68ddc90f7d3db75ce66fbff9baa88e1d9b904 SHA-256: df2b855a973e5e30b907feaf50f38f2fbce4c3ec809933c19599585ea818d59f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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=march+to+the+beat
    • https://mvpartners.be/images/uploadedimages/file/gupatazemodawufidofomixuj.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160729e22a1f47---pirutopibapegasupurerof.pdf
    • http://bookblog.kr/data/file//files/rarazolukiditogobususid.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4de09bb0d---xawejebunedofupanubad.pdf
    • http://zafirkort.com/uploads/files/19059187510.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/18749578384.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098480f54c79---138066546.pdf
    • https://eltonltd.ru/sites/default/files/uploads/54325457336.pdf
    • https://dancleland.com/img/upload/file/68647465850.pdf
    • http://computerdoki.hu/user/file/gilafabosalukopifisin.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de8a3696fe9---kogutulik.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa84d0393---73589261184.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ae52f85dc9d8b730169ab48170295f92/litunetaxefumuropofavul.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d717c9d85---63123459822.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/h17sp059r277uapfai0rf47anb/5665384766.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/1824406513.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c41a50b85---35419294999.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c594c9d30---33238962140.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/067392aa4e1814e603aff52fcae52427/76952482865.pdf
    • http://logistra.fr/ressource/site-image/files/fuzokow.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/49154746791.pdf
    • https://alexandrapanayotou.com/web/images/static/file/25798958711.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3bf8a314d---30620716652.pdf
    • http://kulturazebrak.cz/userfiles/59180793242.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013565.bin
9c0a54bb24428470bf19714f258ac8f450b17ee5cec8246e3295aafb7961d2fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13565 8976 bytes
font_01_sfnt_off00015315.bin
49f1c9250a1d3f3fd1742cd7ba8c325c70bde1106d7b48269ea964c138300384		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15315 10048 bytes
font_02_sfnt_off0001698f.bin
849dc72e3c37bbbce3d1aeee45934fdc323375cf746bcdb2d53048c9bc3b2d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1698F 29176 bytes
font_03_sfnt_off0001ac1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC1A 16792 bytes

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