Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e9c71a574369d0…

MALICIOUS

PDF

79.8 KB Created: 2021-09-29 10:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1ec0ea14620e0d3a96e182c906c15c6f SHA-1: adeacf75a8b0610e8aa0c107a01b7fa39fed6db1 SHA-256: c8e9c71a574369d092e67c421ddfaea9b9f0a3c96cadfee7a110e08835918257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pistant.ru/uplcv?utm_term=how+can+i+unlock+my+phone+if+i+forgot+the+pattern PDF link annotation
    • http://ateliergermain.org/sites/default/files/file/kukugozutolajibakevet.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/78835137094.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/34983618353.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/godunobazonejubatoxotenel.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/9709e624a9d9acbbdcfa8bad82a4e026/vosaxozozufujosoxuv.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/mutawogijotumajufazubu.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/ditezefako.pdfIn PDF document text
    • https://intersat.lv/files/file/79652082573.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/34304592273.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/larasarisoxemojuj.pdfIn PDF document text
    • http://kmimmigrationlaw.com/userfiles/file/navisudebijunavuk.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/63514228023.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ovbjug2f0gv1bosof1k4ocbcqk/fefagenopejin.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/rifaketalod.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/limojimowebafalegulufoko.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/6qi5abr32106ooksk78oipae81/gobejemivax.pdfIn PDF document text
    • http://umhouses.com/uploads/files/4787508063.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/41701373611.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/davazugerifuwusozavavego.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/saladeviroresov.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/61582323946.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210916_498A6C28995629BD.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/67211509969.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 19420 bytes
SHA-256: 7257981a4ae4b3cb394d2742f0b2a4e2f8f7137fc5c8f5a7f3fea9ee0df1e863
font_01_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 11140 bytes
SHA-256: 61ec812bec3afc0677f2f709a55a8b0f2e7dfe6fac597f0c23aecedac2d101d2
font_03_sfnt_off000118a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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