Malicious PDF — malware analysis report

Static analysis result for SHA-256 4324a0b290766d6d…

MALICIOUS

PDF

96.2 KB Created: 2021-08-13 22:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1e98e89fcf14d92704a739965a3484d SHA-1: 50e7b873de1a16671d77ae6c888855c2f0211c64 SHA-256: 4324a0b290766d6df672d52be728ff972d13f3aee781ba1f9ee461a395fc4213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to redirect users to malicious content, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d9c76a4dc2ce3f1b8a5636fdf2c40457/vutunivubulirif.pdf In PDF document text
    • http://tokyoracing.hu/userfiles/file/29576015814.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/22107930930.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/169625381960b3ca7dc8345.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ae7b01c5---makelonoweralepelatorase.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/83030634636.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/kakuga.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/jaxor.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8ae0ff9e2844a169b4d4d828e882ce27/9274923825.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f6614ede---13023912494.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b321b9ce9de---xipumigi.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/nidujefewupekiv.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/862746d129dae68faf0ae0bcbdbae039/votubifuvinumakilexilu.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xakojutirelalolurem.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-06-16/images/files/panevo.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rr640eahkv16f6vlh4e3oma0pv/24318996626.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/fojelarexupejoxilumedowil.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/d8dc7b12dd135ce94059ae7ecf71b8ce/witudonogitanid.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/25918680231.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/zabokuzek.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966fed30d06---24881313708.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/8b70c2f50caa3381e04a098e5bb5eb0b/nipud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=new+era+accounting+grade+10+study+guide+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f81c8033e---26523269804.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_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16924 bytes
SHA-256: 3cb0e72fe7a58a5304b7c201f4724b4182e973897663af304883a7c659efce97
font_01_sfnt_off00013ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E4 11200 bytes
SHA-256: 68e1fa9555be3d38d04cb487179de86cff9820c3030e758c7a8ab715574872d6

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