Malicious PDF — malware analysis report

Static analysis result for SHA-256 678532bea41b6927…

MALICIOUS

PDF

84.5 KB Created: 2021-08-17 00:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3723b5c5ba90ed07b2fdadf31634ce28 SHA-1: 569518170511693a79986d531804df88361ca909 SHA-256: 678532bea41b69274ffde0918c005d68706776a99d98b9153e0b7fcdf24778c3
156 Risk Score

Malware Insights

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

The sample is a PDF file identified by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites. The ML classifier strongly flagged this PDF as malicious, supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://garglob.ru/uplcv?utm_term=lg+front+loader+washer+parts+near+me PDF link annotation
    • https://honda-otolongan.com/upload/files/58466309397.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/40816777600.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ddca73d47---20406455978.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/rusuzubekirelesos.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/efn86oarvgc0n3enl6kkotghhn/47203334188.pdfIn PDF document text
    • https://magerp.org/upload/files/6685040780.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2881c57064---jekiz.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/pakinabasufusite.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9badaf804---werapuruwefewakulan.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/db59904a1bd4954d0168917a2300ccc4/91766725557.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/38ab4ab62b513824b6e465196a567415/50695244231.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/61387985488.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/73254262322.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e4622ad85be---sujabike.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/pidalaligovaduz.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/58584029325.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47cee61470---foxodibifu.pdfIn PDF document text
    • https://jotelek.hu/files/file/loguveriduwi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3tgkcpuhvei31d99mf94db7qv7/82099687958.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/64023446573.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/34778903675.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4cd521a312836a5630584ce83790b02b/fevozeneropowafaleredix.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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 10896 bytes
SHA-256: 4523bbb4826893411ab70d0fcc03e25498c22bd3b2aa8058ab0a2b6e5631a0c5
font_01_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 16136 bytes
SHA-256: 1590fc960ee5b8fbba530be20ecd7395728ee9f9b69979620c6e57d26abcf7f9
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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