Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2f830f13d600bd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-01 11:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d931ddb3197c5f9785bb24055f575439 SHA-1: 50738b4714119b5bd42eec2844a015346392942d SHA-256: 9a2f830f13d600bd9cf0b32d9fedebefd02d7c09067bdb686b3dc90ce28e9a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://sherwoodchambergolf.com/ckfinder/userfiles/files/boxilodikilurufubewavaju.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161221c314d142---tijanakanamoxunurejam.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/jumodomovokuk.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/6971690836.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/xasilanuvulitetobudago.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/bipodijugigoke.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/35778440828.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/62181191776.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/27e7051879ea1d7f46a05e15123df1a6/lifewuzobexukeri.pdfIn PDF document text
    • https://europartner2.pl/uploads/90374471002.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed033ef791---80875484628.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5230fec68406308e166f92f3631af75b/vazalaravisupem.pdfIn PDF document text
    • http://thedreams.cz/files/gujeramegepolegudowedoxu.pdfIn PDF document text
    • https://emmaushuis.org/pages/68296422037.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/7060155e1d2ae39ec467ed658f9c4574/58952141088.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/tamasemijubifezev.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/vigexilurekuwanonawej.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nofugoliselerexupafakef.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/vadutopikozi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160794ce0aa1e6---xofemajewalalosokogipel.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9jshbt99o1g42kamalq0ja98ih/tujilevolasefetonepa.pdfIn PDF document text
    • http://qca.ch/userfiles/file/89830640912.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4159c1efe---luxuvosowarikerat.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/76562022540.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/33963752916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=unable+to+do+sit+upsPDF 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_off0000b9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C8 16076 bytes
SHA-256: 90ee836e535e35f79ebf790b81091ef58c443849eb21229d571fc1f838425f5e
font_01_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 10532 bytes
SHA-256: b23ac7428072959b936352f748e2b4aad1f768d2ef100786e5bcdbf298638a5b
font_02_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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