Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc9e5feadb53345…

MALICIOUS

PDF

93.4 KB Created: 2021-09-24 00:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f5a9291400fed9986d60468ea409a64 SHA-1: 88d20a14d4bc5c0e13d42c1aa080659ddefde9ee SHA-256: 6dc9e5feadb5334538a011073e85e5ec864b50cf9523b72e7b3a7180a10fadae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://whipitleather.com/userfiles/file/sabanavoso.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/a6p25mftgdponqspcpbm9a22k4/98821042861.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/gaxesibitumudexi.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/26750333043.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/lamabaj.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fdf1fe09---babetizakofadugu.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/xapovujisasedagijavuf.pdfIn PDF document text
    • https://wsbtitan.com/images/file/gagajasaba.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/tebakosiweligowisevu.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/dnf5i8ho5kkjtsovhgsbegpso6/nokove.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/77837985235.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/kawetaxafeto.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/1975835902.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/9324529759.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c315c0b0---73449817027.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/wazed.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/folonidexebulapijuge.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ae2918bf---vubezefidugasasilizoledo.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/88830925322.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/jepogipabarezajupusilawin.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/87786456443.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210913_C24FD5EEE0BAC98C.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/fojodinuvoxeravoso.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/15974131046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=police+cheat+code+in+gta+san+andreasPDF 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_off00010418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10418 10652 bytes
SHA-256: fda8f758f6d135154992c3f603fd6947dfd7c9394302b58bdc6683cb0e125b7e
font_01_sfnt_off00011c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C30 19868 bytes
SHA-256: 8585deec7d28350515a188ae8b67b28df8d95ec4e29c89c85914521ee48fb66a
font_02_sfnt_off00014f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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