Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c4a7f3abcd4575…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 03:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d1af1f5f80a3befd731ff8c86a770e8 SHA-1: 08f66e2e9604de15d423d2b2fd08331807ef6bfe SHA-256: d8c4a7f3abcd457591bcff3b5e92943a72ced2281bc7e0455b0aa3b72e70c54a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ratosatu.com/contents/files/90672103310.pdf In PDF document text
    • https://rajakeempat.com/contents/files/xisisig.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/zojagubewolabakuzi.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/ritumewejafewize.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/hm8553b2j05nrhihmho18is0i8/xedodixigunitare.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ogerexeluradir.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/dekufelasoxufeva.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/4625551482.pdfIn PDF document text
    • https://digireg.nz/upload/tomiwebup.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/sufazilinowuj.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/xijajenabojibu.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/36537058746.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/70422900094.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/54773620482.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/belowolati.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613278c908e42---85388494622.pdfIn PDF document text
    • http://husplaza.hu/editor_up/dukidibawi.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a8c0bf29ed96bed4b10a0b835cc332b2/79705247245.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jixeb.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/gomuwifufafuzige.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/45907343865.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/50292618675.pdfIn PDF document text
    • https://dintek.eu/uploads/file/60033245403.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/52853093019.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/17206619405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=harry+potter+breakout+roomPDF 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_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 17700 bytes
SHA-256: 3a11ce70e6eb9097d454e79ce3c05454769fab310bf5fa472989874725d0032b
font_01_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 10440 bytes
SHA-256: 2b91a2df16310b736fbe0fa97e619c7804cb2b0eb9a3d34339b4dd15ce0af860

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