Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d79c3b5e69801b…

MALICIOUS

PDF

75.5 KB Created: 2021-07-04 20:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d77b3b88cebbf533f9d89eba3a497155 SHA-1: 494f7285b31cbccefb67a14c9af1cef870753d84 SHA-256: 45d79c3b5e69801bbbf0987278589f04b0640f8a012e8cde649d82fee849c6fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the links indicate an attempt to lure users to malicious content.

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 https://huntic.ru/uplcv?utm_term=novena+to+st+gerard+to+conceive PDF link annotation
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o80umhtjp5ata8v9pflijiedu2/zakota.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/12236235449.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608157945bcd2---suwiririgunurivow.pdfIn PDF document text
    • http://jngf.cn/files/file/degurovuxijugozipap.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/nozamatizoseri.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722fd554b85---raxip.pdfIn PDF document text
    • http://hudsonohiohighschoolclassof1980.net/clients/7/7d/7d4b1ad73701457990394555a34ab01f/File/20517367826.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d4bebcee---65658339647.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/76108706136.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbcb027a72---48684573238.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/72fd39cc3b11d38c8514101e9eb381b3/tolovanap.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210616092049.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/i2ml8itgl26aij00tlbevne9p0/xonomexekit.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/46050242626.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912b0198a07---2545260573.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/19/files/texulotawakuxefuvi.pdfIn PDF document text
    • http://tencanpowder.com/d/files/todikojupulitanu.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/6862888729.pdfIn PDF document text
    • https://stopserv.ru/files/file/85637724023.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd77f0fe81---fisepabamiwopo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878d5cee547---98872040433.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/54601791354.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/nufujopebugow.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_off0000c3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C5 18156 bytes
SHA-256: 09ce03d579c9a5a8c0ace1e023192d0282949792feffe007ee8fab40652800a7
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 10540 bytes
SHA-256: ca5c018ab2b09f4aa9c37bdfe4a098c5742b9e77b631e528fa7bd05569a90d68
font_02_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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