Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8ca8d966434bdc…

MALICIOUS

PDF

221.2 KB Created: 2021-06-21 01:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6b4853b2ceb5dc9b9a9b43657bb3430d SHA-1: 21966d15ccce9a96f8dd0d944853885412a58f07 SHA-256: dd8ca8d966434bdcb5c71a86b586816b41500fb4e77b276607a6dbff571e35be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs and heuristics indicate it points to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of multiple external links and the 'compromised CMS upload' heuristic suggest the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=les+miserables+school+edition+script PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210618_184709.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/82637b53af49ee6a2169ba02aec38066/57471835386.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/57457397285.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/zijotijedaxusa.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7c16f51b---gezosafojivap.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b33cc95d4fa.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/vh4o00ck1skqn9rlu95i5o0ie7/99765776597.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4356287adc10f001cfeab741340ced9e/rusuwafowo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c97b972f0---52536608380.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/6124559071.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/25409990279.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8ccbc46094f7b54c1215fea9eeec54b9/wukarire.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/81971469055.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba51789761c---zelawexexivojadaxixazap.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/69144765942.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b731f48e864---23888996425.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6d0d9c0e8f17af1fcd4da69bf7afedc1/16965414495.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00032ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CA6 5396 bytes
SHA-256: 4c5fab2a42cd7b180e2e4f40eaf43bc238686f68c29b0a9873acd756b5c3a32c
font_01_sfnt_off00033ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33EC3 11376 bytes
SHA-256: 53645cf690c0793ff2553a2522c5a28d28699763b3122aa6996abf15fd15bcc4

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