Malicious PDF — malware analysis report

Static analysis result for SHA-256 996bc01a17dee45d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 22:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 844d210eb1d86227b00e045a6ac0a8f9 SHA-1: ce6cd81d292729c4d6f1c9ca66cc540ac08446e8 SHA-256: 996bc01a17dee45dfd5895f489c77d32807027df85778c1f9b36c5bb5857de22
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier strongly indicates maliciousness, and the presence of external URIs and link farms points towards a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://aakritidigitals.com/userfiles/files/84734770748.pdf In PDF document text
    • http://inspiredindianfoundation.org/uploads/67495662084.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210912174503.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1d7ei420n5jtjo3cr8pccdsn85/pinesukijizujejejafix.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0541cbe24---kojagemuduberuruwafovijo.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/vawepiwapaj.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/butuvegebizafafumowax.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/75742659953.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/fujopopovudunet.pdfIn PDF document text
    • https://epiphanych.com/images/file/kaxujulabixutimelazosibo.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/71224854074.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210916022835804.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210914_4E4FE64D8867438C.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/93954092844.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///39779465424.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/tixijakapi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a2f148449---dajawosujitewajoduli.pdfIn PDF document text
    • http://dursunguney.com/userfiles/files/fupox.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/wojesusolutevenanages.pdfIn PDF document text
    • https://alohasafaris.com/files/guniwubevixosujutokumo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/foriwarokutugo.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/73264973476.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/notulewiliwiwupudotiz.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///munozimexut.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbbgipguklolu3u6c4sl67rmb2/dagokovukomoratigexurupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=damon+salvatore+moving+wallpaperPDF 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_off0000cef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF4 16952 bytes
SHA-256: cf8321140e5eb5346b6580d3cae5a16e32a08e63e7360d4f87975a91cddae6a9
font_01_sfnt_off0000fb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 10748 bytes
SHA-256: 1317428cbb1ef2d649248324961d48332b069764741a49676e2d007f0cecf2ce
font_02_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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