Malicious PDF — malware analysis report

Static analysis result for SHA-256 287750303da2a4ed…

MALICIOUS

PDF

55.1 KB Created: 2021-09-25 03:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f8ce73f348d872f1ccae5c25e5e10bb9 SHA-1: 9de6e1ba27ee3989c9c0e8a9651faf308c53ff3a SHA-256: 287750303da2a4edbcba2d86f34284484a4e93bb09a208a61efea468d710aa2e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF acts as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7236

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8a0de8de893210a483850f20835a42ce/vudepof.pdf In PDF document text
    • http://sro52.ru/uploads/files/66614427860.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/xinirojevesifazusubusav.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3c96cb8e---tiwosimipi.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/goxezupejopesuwubenupexiv.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/55806428929.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/devogudaxuxuwovabut.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/nokadabutojujudikusibega.pdfIn PDF document text
    • http://husplaza.hu/editor_up/vorijagijadalani.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/27012684803.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/salopubiw.pdfIn PDF document text
    • http://aa-nusd.jp/58175316041.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210911_5D21D21F0B8CAE54.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfdd57e38---95690635739.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/ripod.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/8674516523.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/pasepowusedorifotisesuvus.pdfIn PDF document text
    • http://fourfoods.com/images/files/rusipupatalale.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/rugalufo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbe93db9a7---tizavogosugitowojufo.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/34509280983.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/50613957017.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/rugejunakudolatumera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=kumbalangi+nights+movie+torrentz2PDF 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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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