Malicious PDF — malware analysis report

Static analysis result for SHA-256 20561cc963aa8285…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 04:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b61f44a9033858ea8c1a206af213d71 SHA-1: ef16545b7bfbdfd530ffe2e70e58ece812d7dd8e SHA-256: 20561cc963aa82855c45f5c90691448b687206cfde8fa576856a6ba79f6644f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://tensoinox.com/userfiles/files/masivijuxaxukudixana.pdf In PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/d9b1016a3776c840a8238b32ea94c151/41901170508.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/27266267804.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/lamelak.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/zatufumosi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3f82e7e39---xabotulaxuture.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/91560736154.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac318c3cebf---pusorulalosojopugemuguwe.pdfIn PDF document text
    • http://santeh.md/img/files/nibawubisikanag.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/23531830540.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/49120698231.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69917307857.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ada56326d0e96f3a64dca740144e482e/depuso.pdfIn PDF document text
    • https://aayams.com/userfiles/file/29521299285.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r1hmbjid84qnge6vp6ardi98o3/tujabugabosezalopinumep.pdfIn PDF document text
    • http://spharma.ua/files/file/duxiripi.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/51348624884.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mevasar.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pqv5c10oub5lcdcics9oakuvlo/duresukovogeposaduxexawob.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/luseluze.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/4i2pgec0fc0stde66tsrm6veea/sazagivilofilufugoviwozev.pdfIn PDF document text
    • http://greenld.com/userfiles/puxufebufoxurepidido.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/98406197882.pdfIn PDF document text
    • http://unseretochter.ch/images/file/kusadikugose.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/tijodevanowofuxow.pdfIn PDF document text
    • http://chpcentre.com/files/file/43826042685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vaillant+turbomax+boiler+manualPDF 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_off0000d3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FB 10412 bytes
SHA-256: 2cae24aeb9ac50e8f183b243c1f63a73f8007377750b320a0ef2cae808c18293
font_01_sfnt_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 17812 bytes
SHA-256: 3bc1e394a978d9572978b759d8864e3238b42a44111d1dbc8d618f806a6bc60b

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