Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0de4bd4503e054…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 10:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc5c11a01d2a8ee132f99446a6bedb5a SHA-1: b230387e5e4561ac4791442b76ea04b4d2aa78f1 SHA-256: 9d0de4bd4503e05466adca505f9d13bb45642f28c75214dfa1a39d40953ffbcd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, forming a link farm designed to redirect users. The presence of urgency lures and download buttons suggests a phishing or social engineering attempt to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://partnerplus30.ru/images/fornews/files/jinaz.pdf In PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/boruzivivanezutiw.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/5277601788.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c7179034a---26183452669.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146808c3d437---narebidadapazazomike.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/fewobajipi.pdfIn PDF document text
    • http://pmke.cz/pictures/files/22144035121.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/semaxoburix.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/vedosasiwabeguxupod.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/71104207733.pdfIn PDF document text
    • http://keitbg.com/images/files/bukulumodavoxebe.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/fijixapakizamafujew.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab65cdeb4---fipofonazifawetarogos.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143de855dc34---zurivetebetakonefa.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/95821943896.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/gusiwebilumesoxis.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ff7f7769a---zimona.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/kirimadadumonu.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/tafubafubifuguxuvom.pdfIn PDF document text
    • http://talleresjpg.es/img/file/13385590532.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/jedafukabos.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/8273032074.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/45513910831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=commando+full+movie+watch+onlinePDF 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_off0000bf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 10756 bytes
SHA-256: 2e08147e1165105cafb2eafd4e707be30decd796e828fadb1f972c69ab5be88d
font_01_sfnt_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 16500 bytes
SHA-256: b7bfac8cdcd137af61d6bebb6ff9ed36e590bcf4194ae5b4e46aa5885fb3cc8c

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