Malicious PDF — malware analysis report

Static analysis result for SHA-256 777616fa95b1ce50…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 20:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76b5f8a66f41d273d48134554efb55eb SHA-1: 9a3fd3e8b82ecff8b48214e1922aa077402cf756 SHA-256: 777616fa95b1ce5043e8ea6fb1f05e9f1a56d390b874c620c1399df107aa5a10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the compromised CMS upload link heuristic further support its role as a lure for phishing or malware delivery.

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 https://allytemp.ru/uplcv?utm_term=financial+support+sample+letter+for+financial+assistance
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/7718468075.pdf
    • http://capmar.eu/userfiles/file/27746431822.pdf
    • https://cuisinescartier.ca/upload/editor/file/lowifekalenuto.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086cc94ef6a6---80829303470.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c633f60ad4---60233381460.pdf
    • https://fnb-concepts.com/images/uploads/files/liwebipifofogusiwezir.pdf
    • http://garderoba.sk/images/_file/bimamogokami.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917ac4acb26---45816035293.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe088f3b0---rufunesujevov.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/21r32vgfgdei80op06p9dgtlj3/soruwekatobowarir.pdf
    • https://stef-nancy.fr/upload/document/12576589695.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gdvff33fpgn9i3v53v2uunipue/jepipuvukifutaxatitewateb.pdf
    • https://luyenthitoeic.info/userfiles/file/jepuki.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/jidepo.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abb83b1506---dusosalamaxewurikugor.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/68049467463.pdf
    • https://lesfeesdelhetre.fr/upload/files/lerepotorejuxosijadamot.pdf
    • https://observatoire-omic.org/documents/file/gofulogovu.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608586a58e439---pibesediravefowubore.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf45ce10ef---vanimitinemadovogideki.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160abba70d3bfe---kotidurugasiwozubibopejaz.pdf
    • http://cancercareresearch.com/userfiles/file/28749342043.pdf
    • http://dailymaytrogiang.com/userfiles/files/zisufadiporebufajadezekug.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9e.bin
827aee649d5672b47f45e17889d4ba3982a9840a6e7698bdc500a27a8aa930cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 10716 bytes
font_01_sfnt_off00010736.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 16792 bytes
font_02_sfnt_off00011f48.bin
fc3282aeb7ddbdf3f81faa43d2195a0fd5b48dd11b101f966bc9a27de7d5ed31
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 16352 bytes