Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61419ad3b37b60b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 18:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7dd0b3d9cd74807a5f0c433497d9a8d SHA-1: 23bffd6a169b3bfa03720cfc9beab0c6c9a10fcb SHA-256: d61419ad3b37b60b01314e5e24c49de092d5942d41648655b5e164785ea06b29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests an attempt to track user engagement, common in phishing or scam campaigns. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=witcher+3+install+mods+manually PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94288803e---binojiboz.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/39ip09svajripc7bfs4nn51u0e/gomixokefilemiseva.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bunepipejawedizadugezo.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/98399641344.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/pli52ec25uhmtpavht2r7s28o5/zewoliminujuvuditu.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/xujiwojoriwefamonudevu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8cea3cc489dcaeca323d6e3be5da850a/nuleriras.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b6c29f2b---83380346226.pdfIn PDF document text
    • http://kotolantopeni.cz/file/gewinuwaniwujakagoba.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094c062c0934---buzufenefukazor.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf30d9f83---zamigibutiza.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b8838261---jebixisisugagere.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/rered.pdfIn PDF document text
    • http://halaljones.com/uploads/files/58503904291.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/sebulirifuladezuwi.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/60458793425.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5e779e3ad243cabd53c13977cc172d7a/33596877429.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/22410771596.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210901_A2C73C887EE1F330.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/13251641660.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720afe93902---kodozuridet.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/serobejebepux.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/xukolu.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_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 11012 bytes
SHA-256: a46d524c6f42faa2fffbf6987adcbd7f01cf6a0952c1cc863d92569fe84bd7ac
font_01_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 18296 bytes
SHA-256: 5baff09d9d7d212362b47b022cdd17e94d47630406571a89e9c1b2571f3e1d6e
font_02_sfnt_off000139f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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