Malicious PDF — malware analysis report

Static analysis result for SHA-256 175abf76fcc20259…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 01:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92c01cc2504e8a99242055dce363d1e1 SHA-1: c5b25fa70ed94851f7c1bad5ad8ee44195e16925 SHA-256: 175abf76fcc202598718b347d6fcfec04d453540d645009001ed0fa150fc5a03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vanvoorst.info/uploaded/file/1696507999.pdf In PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161450050edf8a---zawesumolofagowexe.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/94352217393.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/77247118168.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/kiwegarilelozapoworosow.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/26176835145.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135acfc523fb---xisaxebederipunuvage.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/54159525187.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20121965953.pdfIn PDF document text
    • http://drtamerturan.com/file/90522683543.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/wolukewawajuv.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613675251dde5---tojumowuranegaxejotusav.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131797fa375b---jibare.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/suxuvipilufitexeteg.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/97292082356.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/wowetuxupafogatufazo.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/wopojokazozejonakibiga.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/gexegowozonewovusud.pdfIn PDF document text
    • https://wsbtitan.com/images/file/96437483106.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/80049122037.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/82ddf184e20520a780dec67447bed502/vemibemide.pdfIn PDF document text
    • http://vaithun.net/upload/files/58885257393.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/larakedi.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/33054316747.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hitman+2+game+download+for+androidPDF 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_off0000b4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A1 15064 bytes
SHA-256: cc63efc8d5b204d631e568fd107b4cf56fbb2f6a30838d46f3693df04cec4b44
font_01_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10724 bytes
SHA-256: 3a46b279414cf1b603d383ccbf5d3f763242c71ccaab2760c2ffc2060f0e7708
font_02_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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