Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0db25ff08502ef…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 05:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7dde7896dfa048642047922f435f0034 SHA-1: 7ee616a063f44e996b4b08a2e5cea95a617d84b4 SHA-256: 0f0db25ff08502ef3bea54d7226ebe85fcecc196d3c4d1ec187d6e8e774ac99d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=money+cell+phone+cheat+gta+5 PDF link annotation
    • http://marinda.ru/pics/images/file/95547591691.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/firujimoloxego.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/pewibuzu.pdfIn PDF document text
    • http://maulich.vn/attachment/files/fadaxejodajuvafovezekoz.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/78lv3knf3jdhmukb7vc8rast9l/rojakopuzeloto.pdfIn PDF document text
    • http://keyday.ru/files/files/xokinidabemil.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/metuketawuguvez.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/20094322939.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/67283211866.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/48145650405.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16132f77c9b4ec---82339907768.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5f852e4b---jamexamebemafew.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/mokipejufaris.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/28287817776.pdfIn PDF document text
    • https://ratodua.com/contents/files/madenobisugadadam.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/75212974221.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/93684357414.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/40183715090.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/58274879734.pdfIn PDF document text
    • http://valosagoskincsesbanya.com/upload/file/xigijupufurewi.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210916125021.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/25457034598.pdfIn PDF document text
    • http://ippon.lv/uploads/File/bijuxawesalexov.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138129d4f5b4---15196486147.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_off0000b84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 10532 bytes
SHA-256: 9541af3e6aa5accb77690028904232c86eeb0990d7e76223fc8aced644fc1937
font_02_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 15040 bytes
SHA-256: 6caf4f313f145c35256571bed26f6c8e2c551fc74567d77e29da2a0af5430500

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