Malicious PDF — malware analysis report

Static analysis result for SHA-256 041719b612bc25e5…

MALICIOUS

PDF

93.7 KB Created: 2021-07-14 06:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 48ec8883508503d4522d4c02244c503d SHA-1: 65797e7d39fb122ce87554be2afbd4f1d6bd54a8 SHA-256: 041719b612bc25e57c5442cfd04a0564abbba636908871f0279d844d32679397
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV, indicating it likely contains malicious content. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.1620

Heuristics 5

  • 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.
  • 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 https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d6a9c47de02a6818afce7922d586f97a/rufoxikulewusixajuped.pdf In PDF document text
    • http://hani-bee.com/userfiles/files/79278967253.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b4fa9af8a003bfcd7c632400a8b97927/10642646161.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/zisowe.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/320736fc11517b868269fe7aa2aaf62b/bizaliridikutirogaxepizi.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160808136e71a8---59858294232.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e26039cbf11a3fbac747c79e585c916e/jelinadevi.pdfIn PDF document text
    • http://immopolignano.lu/images/nebusimuzober.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/fetewutifavirukafudij.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc830dc6b16---78109628153.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/oihq11batkvf572vja3l1r9d7o/bokejadepibaxevovovik.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f884de835---dodawigilisupez.pdfIn PDF document text
    • https://petikdaun.com/contents//files/17596981060.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6a3ba3d69e5e18bbf280f1d9e8e571df/bazavodugeru.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/wosufujemixe.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/35329010246.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/51178203912.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/75615668577.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kogetezam.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/90784249674.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a5983a6d4---suzodelozixenegep.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/23f2e938bf979ca4171d0425be2e8fba/vamituwunelorize.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/13306953101.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be37521ec---pefetijebase.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/rikds0pebcu4o53gffc73k17b4/45225877419.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ce41c335---fikuxizenevomose.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160880278de2b8---xetag.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d9e52c99aa5a762e3ff8893da3dc7fbf/pupitorazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hay+fever+without+runny+nosePDF 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_off00013a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15228 10620 bytes
SHA-256: e758be2f8c5dcf96eb53be702602a37dfca68f31ea16eae0f97cf5c7ba2855ce