Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76be46e773511b1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 21:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70a1fd4659e6b8cf4b5d2fe346016323 SHA-1: 8cee1fb1f576574b54d46c51484e1b008b6f126b SHA-256: b76be46e773511b1316656c5ea64d0f053501c300d0275796884647d66e1f657
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The primary attack pattern involves luring users through these links, likely to a phishing site or a download of further malware.

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 http://kiavysocina.cz/UserFiles/File/texofegijapixadigipejogo.pdf In PDF document text
    • http://hijoin.hu/editor_up/delunu.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/lekoxusikubugijak.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/betifoxuxag.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/rafexisiz.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f106badd45---niwudo.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dezuluxinisetemipivavewol.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210903_941B2AB28DD44E1F.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/nijidisad.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/powepimup.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135f7f040aa0---nakebijara.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d54f29b3---68564387111.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pk9ni84vceblfqem7jr3egrufo/49993417746.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/xapevik.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/patuxuten.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/vanojogoru.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/38463649613.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/69964004373.pdfIn PDF document text
    • https://jobtiara.com/files/files/93033127881.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba17cf66d---95264128752.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/wosizikipunuj.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/josisigonopevomewik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sms+forwarder+app+downloadPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/197785189.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_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 10628 bytes
SHA-256: cbda1147237e7df772efc3156ddef2ac8f747919827dc76daef790158d50e116
font_02_sfnt_off00010ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 17972 bytes
SHA-256: 5b10435e00ed90c6e5180bbe104ef3f242aad2bb01932403a3816c890b5a0fa5

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