Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65906f45dd0baf0…

MALICIOUS

PDF

87.8 KB Created: 2021-07-24 22:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e19d4e04b3b08e3104155ab5aa687d85 SHA-1: 45c320b39eaa7b31a5c6902146dbc55ba0e3deff SHA-256: c65906f45dd0baf0cffdf70dd5f0a606cc44b8ab9d1494aac9983043dbead3b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm pointing to various PDF files hosted on compromised websites and disposable domains, suggesting an attempt to distribute further malicious content. The presence of invoice or payment language further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://netcsemege.hu/ckfinder/userfiles/files/mozemotog.pdf In PDF document text
    • http://unicorn-furnitures.com/d/files/25576115202.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3mnldgk9tcineqn45mago5j293/mijijuvepazaf.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/83b31472148b80f36da68c0e1c86631c/78760993941.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/48229806847.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jitawubefas.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c41f3160e---nasukesesadujabekelemef.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/hs8s1lsnutaertjh33pvrq2ekp/1755650603.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/j0rvjm1gvnknukko0aa45ej4vu/72229383500.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/81a4284d4355636053f5bc9b2cc359f2/xefare.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8td0bajr2uf089i0nti1s1opn9/44561179431.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160e2239590694---24880059073.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/zedewosuj.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/tawititol.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/98866474882.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd431943d---96046834529.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abc6894570---zixakidodipidulixe.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160763301115a9---21818161519.pdfIn PDF document text
    • http://clingac.es/d/files/safenenosoxozokebuj.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/2826088926.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gokogevujibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=can+i+use+paysafecard+on+paypalPDF 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_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 17020 bytes
SHA-256: 6518cffb6f8f00b3991b7c95c6e9959eb4764853d3a19cfe78359f3e5b8e9ae0
font_01_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 10760 bytes
SHA-256: 7393c278ed938e885e0b2d03ef458296ea029aa289f4163e270b110d523e43a3
font_02_sfnt_off0001373c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1