Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c56478099092c4…

MALICIOUS

PDF

86.0 KB Created: 2021-06-29 01:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2d53c2c29b3a1dadfd20e080cfe19abc SHA-1: 8e2b09ed7cfc4b85c81df859843ea90698106817 SHA-256: 84c56478099092c49dd40e8466567432b66e657cd9aea33aa5e1d33d8002c0d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://retco.ge/ckfinder/userfiles/files/gigugupovaj.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c78a9d5ff1b---40901072119.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/fezotilemisepoxur.pdfIn PDF document text
    • https://digireg.se/upload/vimitujapagewofomuwugu.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/33152411354.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/satomejufepotin.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/27063535356.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/bifivavatoj.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/v8m56tf3me0corsm51qm8b6fj4/tepuvimovimamujo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075d69f3ecc4---25735912095.pdfIn PDF document text
    • http://edgecs.net/documents/vudal.pdfIn PDF document text
    • https://bataretak.com/img/files/file/71388262281.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/9b42c5344a27e944b1f483c2c12efd74/wowudusofimo.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab105be232e---78440007545.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c335f03f2fdc5053243fd3945db3fc32/daxoxurevenilazirogusefod.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/v1g9ml48f8mah22lmoq6ngl5nr/mogowelaf.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c589ef5060d---givugive.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086e887771ec---81961603203.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/451df355996f0205b784a620efd1b9e3/kofibusadiborenojife.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/vufuzumafazavo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/502f2be14aa70cdd82cb241f02eb7a90/gugotijegiponavopo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd59a8fe61---numibovetuja.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/83309526770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+create+booklet+pdf+service+onlinePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 10888 bytes
SHA-256: 854eb305e80c9ae7ef9b8e469af0b3d9ba2442add035c8d63c6f52217de3af69
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 17356 bytes
SHA-256: 7156670d889019c90fb588a266e3895aa7eb8109cd52f4b01cbdf614a8940445
font_02_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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