Malicious PDF — malware analysis report

Static analysis result for SHA-256 832b6500af9fa164…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 21:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef82565b749d012eb3a46e5fb0949540 SHA-1: 4630f83c2e5e3f5328bf34f9ca9c5af3617fa2be SHA-256: 832b6500af9fa16492ea5bc54eba231a1f8352c4b6b586a08d35d578ee96e13a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to potentially malicious or phishing sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards a phishing or credential harvesting attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://laborke.ru/uplcv?utm_term=what+did+washington+do+during+his+presidency PDF link annotation
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutipenutek.pdfIn PDF document text
    • https://computerzone.pk/file/woxunakodoveribij.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/91395556554.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/62430132242.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedc6d2332---67336196190.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/dilojezabiwi.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/9217139786.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210904131221480.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/96074386671.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/bozofopiratinoruga.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210913_045658.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/56876775909.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/74575312157.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3f3704e99ac16fd9b4bb4c70d7c9b9f6/nagadatozaka.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/judojefiminevinowusoku.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/venifinoninaves.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/koxexaronetavisarejepowu.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/xogopobatabuveguf.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/mizap.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613240159c945---29378608051.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/xinaxusuvolixulut.pdfIn PDF document text
    • http://unibox.lv/files/text/27683083845.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca391b68eb---vezigotefujenigotebit.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a16d401414---35459329584.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/veniz.pdfIn PDF document text
    • https://granitnet.hu/editor_up/73427414590.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_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 18616 bytes
SHA-256: c68318a28a89851bdb07007e796d8db82eb939584561d892f59020c15cadfd22
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 11040 bytes
SHA-256: 263434b4147a7dfc816e4a3cea94675438742bff90ab3a0e8cc249a990a92b66
font_02_sfnt_off000118fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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