Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf0f8dc9f001967…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 05:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: cc0c7d9b0be805054e8a0a12302faf3b SHA-1: 1c06bd360f165b157a483f18d2187122234994da SHA-256: bdf0f8dc9f001967eacb8719f69b4272a163e67ddfed52b8bb00617df9ca738b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to other PDF files hosted on various domains, some of which are flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests a multi-stage attack where this PDF serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allcreaturesinc.com/files/files/tifop.pdf In PDF document text
    • http://goodfortune.hk/UpLoadFile/file///26504702722.pdfIn PDF document text
    • https://partnermind.cz/images/files/xevufixobazonarofesaba.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/nalame.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/vonot.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/30567344464.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/78939786905.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/69331259240.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/67915782396.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/55958013477.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/2328730498.pdfIn PDF document text
    • http://evola.it/userfiles/files/2267532652.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/219455171.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/lonenogupu.pdfIn PDF document text
    • http://electric-kernbichler.at/25338007443.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0f0fq9rho700aqcii6oti04bb1/26475184471.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb6fce2b8---3542809458.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908233155.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/televaloxa.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca2b6759a6---tuderepa.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/defizivuwolufatesapom.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/bujixat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=big+farm+unlimited+moneyPDF 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 17652 bytes
SHA-256: d7a73ff7c14fe0b3340e59c97ab2e5a48f1062c9e26842c03615ad093b6a0b63
font_01_sfnt_off00010acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACC 10796 bytes
SHA-256: 9e89d198f479d4e3248c8f6aabfe87a81ff41fc159d07121d32460db6ccd4b62
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1