Malicious PDF — malware analysis report

Static analysis result for SHA-256 190c1f1c96631896…

MALICIOUS

PDF

77.7 KB Created: 2021-09-05 11:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d63871333ca302b39b13949f9f3c2879 SHA-1: 922d0a45eb1f60b8673318bbe80c19c9628a0eaa SHA-256: 190c1f1c966318969b2ccf1b2dcb956d20b62e971a0114a8feff6a2cd23b8495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=ramadan+calendar+2018+bangladesh+pdf PDF link annotation
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39b810603---begujalumele.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210808_092151.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/vetelipife.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/poposilunelasani.pdfIn PDF document text
    • http://etnorom.hu/pictures/wopomazijowovigurex.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/bajufedoxamomexuzip.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/riferabukewovoporodojoj.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/dixor.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/xitutano.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/jojebanojag.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/clufc2ij74miqor80ocjolft74/vixubobubi.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/nijodibot.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/44146987835.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/23177479092.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/ripemigekufituzibojupuxe.pdfIn PDF document text
    • https://yifff.se/userfiles/file/pegazip.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/07faa3af396155f3c774533907b21e2f/30837962071.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210831213051_myvhcu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f06620671---tatiwukij.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/xideluvuzijaj.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/75301106464.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/xekate.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/25818927407.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB343 11444 bytes
SHA-256: 1cb261862573fbd834b7a0f326cca162d649e4c3df9a749aa278b63087114ef1
font_01_sfnt_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CF 16556 bytes
SHA-256: e2e44aa43f5ce82d7ce528ac0f909c98152e61e4b53f029c2afcdbeed0e268c2
font_03_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 16724 bytes
SHA-256: 3fbbe2eb86c4793b8da9acc91d6c06959a4a6c53251b799a0ff9e62d54920e44

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