Malicious PDF — malware analysis report

Static analysis result for SHA-256 da10c337455b7f5a…

MALICIOUS

PDF

72.1 KB Created: 2021-09-20 15:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32a3de2777eed55363abba01f831d2ad SHA-1: c8f8f83fb2035c764a046158d9d169501c7d0a20 SHA-256: da10c337455b7f5a3a664c10c9a66e91e77f95f7b57eb294671e003624180afc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

Heuristics 5

  • 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
  • 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://zatacorp.com/upload/files/60923952541.pdf In PDF document text
    • http://unleadedcoffee.cz/soubory/zazavapeninusasukijemu.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/a0aufgvd5bsh32la55pq6pitca/10182442330.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614723760983b---68212835100.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/4859254251.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/zomegaboliviv.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/wapogoze.pdfIn PDF document text
    • https://trexanh.net/upload/files/98003990572.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///kovawitemepatojono.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/rorebubegijojifu.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/64751775844.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/16302070935.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5401bd1a1---tepalukilovewe.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145797ee4df5---28667012905.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161349b9320d65---36038063307.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/mamekot.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/31136805835.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/26226896681.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/63201986049.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/jepuralafigatonijimeveken.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/74448841022.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/24892191659.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/44362741882.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/54701857215.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/turunaxonizorejazopejof.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/kegaximemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=among+for+free+on+pcPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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