Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abf58d27d18fd5f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 00:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c2d4f17e148a9551bc87e3617869a5d8 SHA-1: 2dbbf1e3993382f943549b6242fe45d3a6b8fca2 SHA-256: 4abf58d27d18fd5feeebbb93eb65a4f3d0ac5255d434e9c2830ab2b913222946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The primary attack pattern appears to be leveraging these external links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://pizzeria-millemiglia.de/app/webroot/img/editor/file/41769356800.pdf In PDF document text
    • https://travelsafeway.com/userfiles/file/8843043964.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eaba83f29---46255857849.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078713840aa1---ratezoboj.pdfIn PDF document text
    • https://landi-bg.com/images/file/42243488664.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/57242365136.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7978f37c2a---suteluwerajo.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/27438916249.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/zaxiso.pdfIn PDF document text
    • http://semot.com/Store/userfiles/file/1123410881.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/sodaxik.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a3aece89---nuparise.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/xekaki.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9jqn00rlgo0a6v2r7sgih6j8nr/70512284178.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/bifiliridomijele.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/6959456950.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/13565794008.pdfIn PDF document text
    • http://klefmarken.se/upload/file/53276432628.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/fekijomixaninepizuri.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/nosilid.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/sakobututij.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/kazepimiwu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/aefb17da42f83cd1099a5a6ce9a02352/zigezosozixixuxiniluxu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0j8pk3qeddpucr3h9gd9udo8h0/vobumaligapuxojamedaredeb.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/vonosanonojanebogomofelul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=destination+english+book+b1+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/44699801774.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_off0000bbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 17464 bytes
SHA-256: 4818f5707eb663d0387fe35a6a9cd463b1ddc9c38cd74e21cb14bf8ec57aac2b
font_01_sfnt_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 10960 bytes
SHA-256: dc0fb688843e0ebbf9320fae34bc31553d8ccf34e4e96d2352ff643c7edc3ddf
font_02_sfnt_off00010214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1