Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fc8e6494533293…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 03:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67f72e13244998287ed662a6613384ba SHA-1: 290b18d6340a614dc32af613d5b56440cf482228 SHA-256: 81fc8e649453329335bcc5c5a99d64fe26fe661c77386b52d66a34d894fb191d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a likely phishing or malware distribution attempt. The embedded JavaScript stream, while not directly analyzed for its content, suggests potential for malicious execution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=mg+atomic+radius PDF link annotation
    • http://mylodge-naoshima.com/fimupa.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/leror.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/gojevumap.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62714685155.pdfIn PDF document text
    • https://e-room.co/userfiles/file/12786589619.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/vomiximavuju.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/simamit.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/pakotetodimokeku.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479c249a466---pusiwidodalesituzurewigoz.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/75890277578.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b648e306a---vojoninurinizuzi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3455f302---fugogur.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/23221283649.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/47433589021.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/18850678494.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/bowimifu.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903135325607242.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/57496400191.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613965400f24c---12703073561.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/pixevosokawiwux.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/vulugamuxu.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/5918164243.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/96349722487.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/54633300211.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/30026170453.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FC 10524 bytes
SHA-256: 7f5abe506e4d6cdddddc8418d38a6e48a451c5f74228cc08c43b28a6f142e2d6
font_01_sfnt_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 17016 bytes
SHA-256: bd013a1734a9b25ceb6e5f8b710580129cc7888656b22318345337033be56da3
font_02_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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