Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfcd50a5947a2a2…

MALICIOUS

PDF

80.4 KB Created: 2021-07-20 14:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccd332959bd58a3668a01df462a0211f SHA-1: 1e6cad7be8c2eba419d625c1d5a32c002abea5ba SHA-256: 4dfcd50a5947a2a25604bfc2ecad74ce38f15def46ce61cb8df2c7575bb3e201
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, indicating a probable phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5544

Heuristics 6

  • 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.
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945e4898cc2---95930158806.pdf In PDF document text
    • http://ledson.ru/upload_picture/vigaguvegagugomezat.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5afb2798b41affce0d526886f5a669a0/xudaka.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a38d94b79---risavumi.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c05c5af32---dujevafixi.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/migisusamujut.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/jivuvuget.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0353357e81---nobozavufadogipafe.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17312bd5c1---wodudikube.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/h3mdiu6vdm49r7oj4a221u0o7d/39809924086.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2b1c0e9915b3a4366640cde65bed06d0/fawirirapagegej.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/jefirepuzelegafami.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/lv27ddkjcq4d890dd7l0ufabsd/simemenasuluzowo.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/leviwuvubuta.pdfIn PDF document text
    • http://guowangcable.com/d/files/18104964801.pdfIn PDF document text
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/sovemo.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/rj92r0e6g221nphnud3tef2tf6/nujesalikezepulugonubaf.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/zerusikafifuj.pdfIn PDF document text
    • http://iworking.vn/uploads/files/dubukujaravorifosixuz.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/gevodiwugaxogexoto.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/watofomitutoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+collective+noun+for+crowdPDF 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_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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