Malicious PDF — malware analysis report

Static analysis result for SHA-256 68482a6914875030…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 21:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ec6d8034d852321a842ea691a7b3e7b SHA-1: 519e21b4642dcf8140c09dec8de4e8a76b55ed6c SHA-256: 68482a6914875030faa33a9ad1f5d140183bb21bf65cf02a4db960b52b1c6652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=queremos+que+seas+rico+pdf+descargar PDF link annotation
    • http://gayaarchi.com/userfiles/file/20210618155353.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/rekowazipevatazemufazu.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/jewinivelig.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4c427fccd---43207065724.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b8a696ba---zevurudonewuwevemenuri.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/tokoxofesopok.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/kirarusobifirogisur.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/27794020003.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dda49aa2c---vesugavag.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/nabidibafupowopijoge.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/ximufodogoromipigekek.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca939d327e---10618608958.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/47674345345.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355cbd761ad---24397598292.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vq7l62879ek7bodmk3nb40ibp1/fopuxudazijazusenojo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b5abcf9ceedb5b815d77e53b047878f5/74637071585.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/50083405445.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/90801229073.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/mobubewevufofidudodenep.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/sosoxarutedi.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/42062417855.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3a3bc047db932016d900b5220a87099/87649809572.pdfIn PDF document text
    • http://yuli-china.ru/d/files/7104811630.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/rideraxidumokejupuka.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_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 18408 bytes
SHA-256: f0110143e9510c4da0d7d2cfc52ebbaec6a791b523cffe83a696ff02def04244
font_01_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 11020 bytes
SHA-256: 2baf690ce7d8d9c1a2172195714833dbf8813088d0cbbdae11ac7f7f67cef657
font_02_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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