Malicious PDF — malware analysis report

Static analysis result for SHA-256 f541984222398363…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 03:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29d9a6555c96e7f396a2308bd554b2f9 SHA-1: e381bc1b2afb56db60fdd875b29284a275073489 SHA-256: f541984222398363bea57bd8204228c742e08386c9817514f199b00b1b8b1cd8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, forming a link farm that likely directs users to phishing sites or further malware downloads. The presence of a link farm on compromised CMS upload storage and disposable hosting further indicates malicious intent.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • 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://nomylo.ru/uplcv?utm_term=zen+and+western+thought+masao+abe+pdf PDF link annotation
    • https://keiba-like.biz/js/ckfinder/userfiles/files/50201321959.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/8145085903.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74c93acf92---jinabe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a38231dd5a0---99787766228.pdfIn PDF document text
    • https://ms01bet.net/contents//files/45449327641.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/dugaviroragisufa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7232997b1---xeziz.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/gamidekafuxiji.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39365c7cda---63415706322.pdfIn PDF document text
    • http://slsnn.ru/content/file/sisokokoji.pdfIn PDF document text
    • http://geose.ru/userfiles/file/fodezisiw.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/kevavesitevomavuwifu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2331ed4f2b---vilafusarerawiterop.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae8b0108b---welemaguzope.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pqc4p3fp0p7n3c14g0cfjfb862/rumodixiwakoxozozumo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3f41f2cb---47446631719.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084557ea7eba---32432395183.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/31172431439.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pesopo.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/6e1d4100f73e63e1755f2f7b4c1ef137/54410093311.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/87717860089.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/29989896600.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/tinimet.pdfIn PDF document text
    • 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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 11096 bytes
SHA-256: e56f0a4e6df8de34ddac49a59fb566065ba7ceaf832c2a2bf79b7bdb52f23deb
font_02_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 18796 bytes
SHA-256: d8d3eaa7956f0a3ae19a7478c977688f9d5339a3e16b96bb95c646a70d8a7ad0