Malicious PDF — malware analysis report

Static analysis result for SHA-256 8659614a58f0f836…

MALICIOUS

PDF

64.2 KB Created: 2021-07-30 10:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d7c9e66b9d684f20d57ad6e2c61f2d8 SHA-1: 7793549c2fa60b0beaf9cbe194503be4d84e4c2c SHA-256: 8659614a58f0f83675d187d73fa543fb89864b9fafefa101c7af381e62d46e78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to WordPress sites utilizing the formcraft plugin for file uploads, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of external URIs and link farm heuristics indicates an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7100

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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983e9c0a8dc---60636245912.pdf In PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/19648866769.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ada76491---28689401162.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48d5cb033---98054726535.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072ec3d46a31---bemunuzak.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/97650317299.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/givizoruxiwi.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/180767025560fc41f5a1f05.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a8c9a447---12550509908.pdfIn PDF document text
    • http://4yoga.by/pics/files/25404166058.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d83bf800cb365d20534596dc430fb2ee/gelowenawulikig.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/476cdc4567565a3fc3ec252f001892d0/29172708672.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/90876575697.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/misuzejotaxolasitus.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e843c36dc---wawinatikomami.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab961eb34---93857761682.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/nozogoro.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c76acea4b38---wapewigugenepazoxalu.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210722_386DAEC6509453C1.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/guzinerofikedemuboti.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/71774364997.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b14786aa5---woforimizosuporanum.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4635a70dbbc443b42fb072c700e08dee/77425737576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=evaluation+addition+et+soustraction+des+nombres+relatifs+4emePDF 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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1