Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1908f458934cedd…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 22:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 358e5417be9061d3aa372d56fae48dec SHA-1: a1a1eed27c071ce747498e242820729bd10ea2be SHA-256: d1908f458934cedd7c6165f4336dafe756e50a705e064657d947d800044abd76
162 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to execute malicious code or redirect users to phishing sites. The presence of multiple external URIs, including those hosted on compromised CMS uploads and disposable hosting, indicates a link farm designed to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

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://birgatour.mn/js/ckfinder/userfiles/files/95957035353.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/67520b339ba44ab86eae9929297006bf/89973033438.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/vovulupelukiredipuledeful.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/34900550312.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210624195221148.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/paxekedebijemodo.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/44075047513.pdfIn PDF document text
    • http://pvvc.cz/files/nemabar.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/gowaxare.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/4043266330.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/sazamewivuke.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66b00a466---fewefodudugusofagi.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/xewexezajozop.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jr1he0b0r8uibog4l1knpe5fkk/81049568483.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fe428aa9d2a815efa5d67fff8edce65/rikozividom.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/vigemufazetu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/13f1e4528924b695825b82c7cb108066/95473843549.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584ae7afc4---48433156746.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/jinomogokub.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/61557688212.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a986acf2ea8---bulivaxemawugaponanazojox.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/66704120682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=forced+marriage+romance+novels+urdu+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_off0000c725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 11008 bytes
SHA-256: f84305af5b2d86224e55539881146d76789a9a8becf3eb54f3a84290ae71ab74
font_01_sfnt_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 20792 bytes
SHA-256: 3afaf5071450359cfef6bc96ea20cbf466803ed79f20d96d9a6f14729010041c