Malicious PDF — malware analysis report

Static analysis result for SHA-256 6743bc916d7071ed…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 13:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e1daded9881c1c93ff85440f0847288 SHA-1: f32b39b12819db5f58216e4264f4d78e9d1639ac SHA-256: 6743bc916d7071ed4207ed4ee6e7ccaff2a3f76ac1d4eafadc17abf0e11210d5
124 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. This structure is indicative of a link farm, often used to distribute phishing content or malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4599

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://jacksonreunion.org/clients/71346/File/jaruwokezeborakig.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/9275dacff1b68b34492eda04a115f6dc/56917848489.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160742331aa1f0---xoxirafuzosisik.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ff40c49372a8a58f88080b82c9ee8200/tulumileruk.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/33599702277.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/21976322801.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/korugofirefemel.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f52339158e4---99461310586.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7ef0aa8d---17086905220.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728c82f0b88---50385113177.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/todupu.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/56458624bbb9a85a7f7f252d3498e03d/kebusog.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/sajaxef.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/21376351742.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/32786505312.pdfIn PDF document text
    • http://atya.eu/files/file/90996809122.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/45e0604536d6c2d9de43a31481ef5ff3/98797409213.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/48503602943.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6de805d5e---waxejaduromiteduwul.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/wigogadizazuvaw.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cab24fdfa60---lezekevatuxevoxuzorebuju.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/doruxojevusixesiwabaku.pdfIn PDF document text
    • http://htygroup.com/upload/files/vejuxawetibatowaber.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/dutatevoduxur.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050823124673499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bharathiar+university+mba+books+pdfPDF 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_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 19168 bytes
SHA-256: 9480c0b40cb772e9d7adb159f046cda7dbed52682163926ed9e45bf1bdbbe6d2
font_01_sfnt_off00014057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1