Malicious PDF — malware analysis report

Static analysis result for SHA-256 440c48343ca610fe…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 09:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25c02570c7ae5f1e170238e17f2f2f1c SHA-1: cb04d7257a7282969f9856c6bfb65ecbbfd64d3d SHA-256: 440c48343ca610feebd5b1c097ac6c1be5eea28ef7e7c8d34181343731119255
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=urologia+de+campbell+pdf PDF link annotation
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/25881957566.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/2297878937.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/fovezamavopelowokulid.pdfIn PDF document text
    • http://llux.vn/uploads/files/lebiwumaniza.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/51569961292.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161432bcd6506d---48899963695.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109040120523572.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/regapetuda.pdfIn PDF document text
    • http://grimastone.ru/files/zovofemi.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/wabux.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/88515956315.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/bekepuxirusit.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6646edb93---31613855903.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/navukunifewobatalagij.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/bozilivafobizaninas.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/jobisapijidimapis.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfd45842d---vetorifo.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/puboze.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/vagaraz.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/84134467707.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/bigegovuribabeges.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/83695730091.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7hpatr56gq2osuufigi3u3ls0/4529618842.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_off0000be36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 17708 bytes
SHA-256: 5d9cbacf059382b70fc6eb0600b1d06b7c4b7c7732c39cf002c9cf2d851f73f2
font_02_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 10740 bytes
SHA-256: edd9bb7013e10cb8885a59947eef2ad2f3f31a31946b9813d14177613f3d85d1

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