Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55ad17beb805b2e…

MALICIOUS

PDF

54.0 KB Created: 2021-08-06 08:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc0795cbc5d64af2e4cbb948a57dc1ed SHA-1: 4160b7b1359e98e98b07570065a77e25a4a9e5e1 SHA-256: e55ad17beb805b2e6af5b241c208d5298009e614f48ed55356d22d4e1bffc6d0
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8290

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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077557d7c9eb---tazojotenafudolaxenavo.pdf In PDF document text
    • http://aqbnb.com/uploadfile/file/5305591437.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/zukofadolujinus.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/960342889.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/13017940884.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c5c2566c6aaab10cfe15c8a27bddcb9/24669796267.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210607_3E144A26EA4F057A.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/96681869730.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/ribapiriletawu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vo61795a287aaj58thpq0q7ul1/jopolowef.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/togoget.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/8m04vrkf6i22bf32q47qm7f39p/zokimiwoboguduvikodaxew.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0b40e8c19b31d9256479534a59b886a4/kosekomoz.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/344049962.pdfIn PDF document text
    • http://goref.ru/files/file/poteni.pdfIn PDF document text
    • http://labonscafe.com/userfiles/famol.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/kerojesujarujiwugexap.pdfIn PDF document text
    • https://airshow-bg.com/file/51973103608.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/fasikexoxaxegena.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/c9s76p2fhcov58dvo4471atfgb/98877408441.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/of9jaolcg8hbioqqbvgqt6n6v0/kamikem.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/dazuxu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735b15072e3---riboxukabugivimedit.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/gedozazuvegige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rival+electric+food+slicer+model+1101e%2F5PDF 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_off0000bce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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