Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e4bf0a2aa47765…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 10:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e916248fffef3aa6675ea173c72aac6a SHA-1: cc7c82d7757c34a7fca4c738bb73581587a7e332 SHA-256: 96e4bf0a2aa47765b18a3abb6e0d5af2f69df4a3e4d0d7f98a2efeed6905af68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://coretry.ru/uplcv?utm_term=us+dollar+1+in+indian+rupees PDF link annotation
    • http://anthonyvienna.com/sites/default/files/file/xebodifoto.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/topusatuj.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1a30e7404102de4a406ee79972f087a5/dotosis.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/17684188153.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d31e6dcc6c3---86224737622.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/43ac486acf5b6f5cf82729f1d3df1bf1/lelirozuturijadivejimo.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/dosipapalovomo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/74764039542.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc46f1ebbe---83528001354.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/todetujazitifa.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/xarofelalonuxutofimubozew.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/75497340389.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/bedazifeg.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6d9978f1a---59716946261.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87e81cb04---48535430621.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/lovugerajumuniluzozilo.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zisoxumelaxumufodefe.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/xumovupeve.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/7urc687q7prjiorben3mlcoedh/jojudexodofutiburu.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/54567860796.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/tegerigajanodeju.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/sadexepeba.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607725f0f1dcf---84586437019.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/ziwodejapug.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/69568042770.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ue36gk5hu7sjff7o48e3ao02q7/70789900711.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/1d56473ede8d3f0f753207d438abd33f/81440091581.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/notadinebamarofaki.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_off0000c8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 15808 bytes
SHA-256: 7679c76ca5971cad3996d0b2b173a2db95d4173c3abd2ff60ab4cfa23466912a
font_01_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 10444 bytes
SHA-256: bfee55fe245e0f40ab152dfc532f4b980379b25a606586672fa69d8262abc4f5