Malicious PDF — malware analysis report

Static analysis result for SHA-256 966466fcb3adc713…

MALICIOUS

PDF

74.7 KB Created: 2021-09-24 15:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52b78edba6f3f90e58e42a33d2c31acd SHA-1: 023805569fd494e3fffb3b577726d2df1506d79d SHA-256: 966466fcb3adc713c3ee044bf061f2876dbddc9e5e180b5c226fd14d5c5a6ab5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://evaemlak.com/userfiles/file///36772335254.pdf In PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210911_0F6C84500F7B294C.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/47909541093.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/zutopufadav.pdfIn PDF document text
    • http://fygl.net/uploads/file/040412585408.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/0e0ee4ce9bdad4471fd135bd5c746c70/wogetudixinaxezagewimi.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/dejutamedurifinafab.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/remuwejevowifu.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tamowi.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64757833842.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/leposatozuzovuniwazoko.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/cb623e773c1b70ecc8fe96b287417dad/68645114012.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/68657870725.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/kinowisesipigigasowebu.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/kurotumifu.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/meguwafu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16146e9f6216d0---vutosadijo.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/65664142867.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210911175709_fod8v0.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/49773676030.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/rapalerozez.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/42477649468.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/sofuzibunubomaka.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/15562333577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=download+zombie+combat+simulatorPDF 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_off0000b73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 21020 bytes
SHA-256: 71aacca01ea3c5379544d022032e6dc9dc1a8387927de81e4e9a78af08bb5be4
font_02_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 10916 bytes
SHA-256: c8d496c6c71e1836018347c1a7764b52367ff755a7053268d615bd4e0dd98ccb

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