Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b89fcf164b0a88…

MALICIOUS

PDF

95.5 KB Created: 2021-06-25 23:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1c090b734064189deb055e6ac52a67bc SHA-1: 6980e12d48a2434c3167cba25630b7ac5ae5ed3b SHA-256: f8b89fcf164b0a883aac6278dc4cd81c2371718e0bb07b0fdc8ea10778d83254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the heuristics and the presence of numerous URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://oniceh.ru/uplcv?utm_term=aldehyde+chemical+structure PDF link annotation
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83719237b3---39481088908.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c886aaaae56---63210329355.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a60932e33b7---52362976610.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/82371779313.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/47873739317.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5c50oica85jtotbbo78ivi99l7/sefefoxelitavabedo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d85fc20e3---6507357034.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/3806529431.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qdgkeenq6km13itd8lovq49rbh/xenanelujojafodivi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/07eb2e9356b562789f467b042cad9be5/49459572039.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bc5219f0---xaleranefet.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/tiredajatuxirozup.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5a885998---35252150671.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/b36plq53jgpjaempbsq4dsp37i/17726458742.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab16467f9f---366290730.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/natitexag.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4210112585e78f40a56a12609cad2b6d/vuwese.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/rugogefubevalagew.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca143a385f---dedelaxunefuf.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/42376294084.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071c851216fa---nijunajuzeseravexopimede.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8c812dd8---lekudumofolugotujen.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/7ab0c0d976caaf223deb9e9f4d549ecc/pejanonawixejazopaxajazo.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/74106129084.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_off000111e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E3 17676 bytes
SHA-256: 49dbfbd621ac95d80a9670ec7d47824b72d115514268f511a4cf8d3ce1662afd
font_01_sfnt_off000140a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A5 10608 bytes
SHA-256: 6b9ffa9815168067605e996a65ad0b26058b7a5857a63abfad1a2b3e291ef3ea
font_02_sfnt_off000158e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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