Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5502c604b05a22…

MALICIOUS

PDF

99.3 KB Created: 2021-09-19 06:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fa122fd955abd905709bb99667bcbf9 SHA-1: 2c742d8682ddaadc9a0a6a52a7682eb0c53f30e0 SHA-256: 8c5502c604b05a226347a2b08e88833a1dde709e5226b0843c4f12d573c848ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of techniques used to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1ffe32f0bf85094d661c6e5f07b58c08/42268870094.pdf In PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/57793077699.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/6623818912.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/6746595082.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613649ab4c587---31387878462.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/412d23ad304e4de0ed934ac4d03ba004/72396307960.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/xanaragarazixawab.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/61365702544.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/77030145077.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/lekujopejinadujejuwe.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/subuvixunamebegawitejelab.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/sogubefej.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/16ef1f86160c0b260d6d93b70d0665f6/kivixexepozega.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/mizonigovigepit.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/93976033237.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/74156727238.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109091916035137.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e3ca11ca2de8dc1c09d70ba04061625d/31647726273.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/26077978384.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/78418893117.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16136d22d79bb4---21852200102.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/pewaxumeritazipegegi.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/jufugomevaferotef.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/galewidilup.pdfIn PDF document text
    • http://timocomputer.cz/files/file/79123364135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=aplikacja+do+skanowania+kod%C3%B3w+kreskowych+androidPDF 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_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 11056 bytes
SHA-256: 430d0367e214accb779a18057ee7577ad30cd54548617239d6e70586fe1cce85
font_01_sfnt_off000135f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 18428 bytes
SHA-256: 24c272814a3bea0558146bb786419f3f9135af536251e5be60308c7f86583470
font_02_sfnt_off00016456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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