Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ba01a73f91d51b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-01 12:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18f7f515ce13d97d55e2a7554982b4b6 SHA-1: 80698de95c14132203dbedc4b4052d360f9d35d9 SHA-256: 90ba01a73f91d51b0a9ac344ef3046f739456721a4564b3f76985a3b3ca7f028
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files. The PDF's structure and embedded links indicate it's likely used in a phishing campaign to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16120d94c04252---bofudo.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331e98eb49---nadaxofujoz.pdfIn PDF document text
    • https://ismart99.net/upload/files/16344557875.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11ae94d74---nezakenuxuf.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210607185757_1869264374.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/75688220707.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/7639181322.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xunufusevuwapigapus.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rarolewafobuxos.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/848e73d2e8b32b6c66f92ea1012c4f72/devaburiputaw.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/sk4gkt2acdtmc053d3ga9ltph0/93452890172.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a1e873d04---xefelonulukuxew.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/vakomekufawulojotejigigow.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/73357681862.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/levipuvoxipafaru.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/164a4c16bd831c6e834de49b9cbfb251/12190998462.pdfIn PDF document text
    • https://chp-travel.ir/data/file/86601278467.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/18758797170.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c51cdeaf604---42131927438.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf49a939756---gawoxetabogabike.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d314426754---lifimuziti.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68b9f3bf49---43107693218.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c41b2947f---79577418575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=direct+sales+strategyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 18068 bytes
SHA-256: 1f53960c76823697ba41c9995d1c8f285767ac1668708fe4a03fe2c2ad4ba9fe
font_01_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 10296 bytes
SHA-256: 250b431acf3c378ea81b1b19dd0c30b8fed0c7496685cbd06a1f53cd15957d42

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