Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed28a9af28d6af5a…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 09:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80c4d53159c9c446f986e808628b3780 SHA-1: b040c30e1e2672e3ca357670d0b8da0994146d94 SHA-256: ed28a9af28d6af5a554f5f083002465e40b8a01637f26888dbef87c5226fc320
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 compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://hostingureitings.lv/uploads/userfiles/files/34487657309.pdf In PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/21931887045.pdfIn PDF document text
    • http://www.moyekolodin.com/files/goruponadufa.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/88167650261.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/8480444493.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/bofuxedimasukubet.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/62425938880.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/66221769741.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/94287352323.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/logujejilevurigiru.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/15542649439.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613940597f244---90437506358.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f370c16740---temofurat.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109101521547618.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/rowonokexukabuvidi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n6nfc6qljuoektimlb3h0joo71/nuwadekomewenalanol.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/topoxejepi.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/kisajulojoxivosubane.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc491f2ef9---xujeres.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/19751588080.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/diseba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+locate+lost+redmi+phonePDF 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_off0000cca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 16480 bytes
SHA-256: 9fe31aac6c19969f8a70fa7928f52ad2230b83d7aef894907bec31d2dc737e4b
font_01_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 10856 bytes
SHA-256: 4093ff1357c7255fdfc4989ed842ce82732171f7030c43b2c86b561c49d54297
font_02_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1