Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df3b717d6fe8c48…

MALICIOUS

PDF

82.6 KB Created: 2021-10-07 10:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ed5f2c0c21ac76e72d4edc5876679aa9 SHA-1: a9d9f9b29b072e52874426d0dd38ae9a56c146e9 SHA-256: 2df3b717d6fe8c48c36b304794a75b589ba3307cf5072776f80fa09ba325abc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are hosted on potentially compromised or disposable infrastructure, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://onthespothousing.com/userfiles/file/59431692922.pdf In PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/45994337428.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/85397736479.pdfIn PDF document text
    • http://mayjack.com/upload/files/wilalagaponefipijevenufem.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/ripifofomutadifu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e5235d91e0---pibetibudolozixalewukaviv.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/4196685492.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/83235055751.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/4fb03deb85e6c898708fc32f4da62f56/54517809611.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/19489676870.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///7825966150.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/lafawefila.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/55049561784.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/raxuwufoxil.pdfIn PDF document text
    • http://boldogelet.hu/media/gunosemefofaboradivawa.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/36869828465.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/rovabobofa.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/tolugonugugigabusu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/laretuzolijijofo.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/kebemal.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gelowidedi.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/1495264628.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cb49078c7---pizox.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/busaragoboga.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/54477048615.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ca4677cf04dd0d3766455232b8db6b1c/35551050479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=inbound+and+outbound+customer+servicePDF 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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 17716 bytes
SHA-256: a5799a075ef26b8f9057740bff1446f1e3e22ae0a518016c5e17d52268770ec6
font_02_sfnt_off000123b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B1 10740 bytes
SHA-256: 3a3d23af222a75d834bf437c025303b0bf2816afa486d75822e6c93a6550c622