Malicious PDF — malware analysis report

Static analysis result for SHA-256 865e5956befde373…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 08:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11f66d282aaf336c69a83b71f972d4cd SHA-1: cefa8949ef1c9f054686998d4eec337941474f5c SHA-256: 865e5956befde3738e989848796063fc5a2c7ead28d6739ed331a9d907651bae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

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=numerical+reasoning+test+with+solutions+pdf+free PDF link annotation
    • http://stelmart.ru/userfiles/file/6367304870.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/misatutojupelewofawo.pdfIn PDF document text
    • https://funbugs.ie/files/file/jilodekisupuwisil.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/bixobopuziguxunonikurif.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/somaxipudinugofe.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/lelizob.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7c1dbc7ba---xatukukugija.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea61c2cb66---tofupejopex.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/62674965600.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/11692674437.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/64886196759.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210904_41D63D2C4904E582.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161349cb1eb550---73248101179.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/detitupatarolipe.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/2365866782.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/68312413716.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/50021988954.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/vakose.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/14523408676.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd9e9ad012---57747677724.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/cefec70a562d1c76b02d76c5cc52cd0e/gafiv.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/12743272306.pdfIn PDF document text
    • http://cartopack.be/Images/file/90542864513.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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 17176 bytes
SHA-256: 2f9a5965b2b9f477cc3eee997c8b95532796073c44e211db8b9b47be37547a5c
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 11228 bytes
SHA-256: 3e65bc8e54e826380c3a2337a2f0df030f449f7117a1876a56a212447441aaa7
font_02_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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