Malicious PDF — malware analysis report

Static analysis result for SHA-256 587b9f32a40d735f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 12:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 00297b2b84637785c0d6d847b57b2c8a SHA-1: 214f413fb3735cd2b581c5f5d45bc616f12b1891 SHA-256: 587b9f32a40d735f7a4b0c3e38375eaec9bc57319a61050c3975762738b43bc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, some of which are hosted on compromised WordPress sites, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://okfilm.kr/userData/board/file/45786600211.pdf In PDF document text
    • http://bjjiffy.com/upload/62772047202.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/356d819e20859354d94450bfb3a0ce87/71540974230.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/9724123489.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/65127926730.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/jowuduzexake.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/sobirepe.pdfIn PDF document text
    • http://stonebreaker.at/retifitedodi.pdfIn PDF document text
    • https://liderpin.com/calisma2/files/uploads/4910674938.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729b36a9d25---zujazemufikujivaw.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d328c2272e---pivafonemivel.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/liluxufi.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/71767747655.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/57547094665.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad5c1502b---lirudorajobujivif.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/kowerotiba.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/aucofk3j29o5n3od3brsm8v88p/kujalulatu.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/gefedusufugobuxamafi.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/vukoxubusowu.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/29519990687.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/52e42e428511a15c0f73588dd187526d/5774679721.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/givitufedefakizolasafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=windows+movie+maker+manual+espa%C3%B1ol+pdfPDF link annotation
    • 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_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 17316 bytes
SHA-256: 2d2d871f31d04a9361ee75d1d70a01dfa17fd833851c51d592044f60dae43d6e
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 11104 bytes
SHA-256: 1e8ea36e69298cc7b3089a4a52f40f58e4783eecea1f638208a813d13aa7d024
font_02_sfnt_off00012d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1