Malicious PDF — malware analysis report

Static analysis result for SHA-256 93180cbcd6bbdf87…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 19:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ace4092a70ed68006e2cbc06fd7bb2f2 SHA-1: dfc05b35e3c949a5542a79a6e40676e7e87f90d0 SHA-256: 93180cbcd6bbdf874c140410d1c245ffefb24f989730e359a884d8422b6b32b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=how+to+uninstall+an+app+on+my+android+phone PDF link annotation
    • http://partnercable.com/files/noful.pdfIn PDF document text
    • https://protum.se/file/4290666029.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/8856200433.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tabixonufu.pdfIn PDF document text
    • http://charivne.info/images/file/33493031928.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/46501771925.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/beloxadatebiruforiwo.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/66867427660.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/padawovezipidi.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/61083798939.pdfIn PDF document text
    • http://gyliver.ru/files/files/nomixazo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0d3c3b95aa3d01614bc09ca87256c4b7/92763358407.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c0a725b7c5c13fba803c886e9b4884e2/95019864939.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/88215833509.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613258cdc9d54---kikutopinuberarute.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090602120373499.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/39i6ldm4omglk4q9lph3k6g770/52218516350.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///56055241849.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/gamazalisolokuja.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210906213836.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/25563687832.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/winilizoxuliguzopevu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/73fd572791fa67b0476f389173a7f317/84863390630.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 18672 bytes
SHA-256: c716c0307d12c3f0fdcafb73543f9b21f6792cabaea84a0c00c6e7ba83333c76
font_01_sfnt_off000108a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BB 10948 bytes
SHA-256: d11ea035ca67b4bbf22435151a103b89c4e550e71b1c7e359f898cc8ac07d352

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