Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc6b5eaad276507…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 00:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5183464185d0840992f97768dc453fe SHA-1: 85d40eea2b092658e21b1867679241ddc4d4281f SHA-256: 1bc6b5eaad2765077d8ce02805bd2f084850dbd5036edd2d0f5cafa95966f59a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of luring users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=excalibur+food+dehydrator+instruction+manual PDF link annotation
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1365e6cf86---radinuxalidamokafuduj.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/8082556305.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/76835473253.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8aacb6e2---roxotu.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/74407560694.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608732b4d9e2b---55919603679.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099b3321fb04---mejesabeked.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5lhjhd2fnrsu6u04q48unv2cv7/zatumufekazekivotowugiru.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gagatoxurigevaj.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d62d1d732---wabemitonube.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/78395105823.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/57753889035.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3327da27d---92505467805.pdfIn PDF document text
    • http://linza-market.ru/upload/files/50622882027.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ccc13cc6---vapavapirofizejune.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608e56d344629---tetavorizoxomanetasufimub.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6fd78d1de2---jukafefenus.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/03a241fb663fdb7f048fb9fe81f5989b/kujipowojowa.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/28a809802842de0303bb8be4fee48b14/49466670636.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0c321ab14a32259d58a062b4a85f6044/15531990115.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/82265471997.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/62905712195.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/dilajovutunonupetudeka.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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 17848 bytes
SHA-256: f6d05db824c096ca62ed33b03e08a4d5f10cd04653adc880c13dfd1c88d66bda
font_02_sfnt_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 11180 bytes
SHA-256: 87c0a353e5558efe1860bb6e8ca5884f8eb0da89c94ff807fb254c36f262ea66

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