Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e62e93512e7d05…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 06:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0de71c45c63b060a5900fb470615756b SHA-1: b5cb8cc5485c4565ebcf9a24b4e2f49db51c23bb SHA-256: a8e62e93512e7d0568c84476699fb755101e8064ff90219e6c5be94a404768c1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised WordPress sites, indicating an attempt to host malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document instructs the user to download a password-protected archive, a common tactic to evade initial security checks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c99940e58415010286b4e5cf7d2f1e14/tugabozagevu.pdf In PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/15795758516.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/9691663822.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/leratanoxolowu.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/70797071760.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/32314418971.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/patuwotuxivukepo.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/96851893952.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/tiwolawixikepasiladabos.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/4604184419.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910050723.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/juzakovimuxolajiriz.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139b29dc527e---kudogomalidupagukaze.pdfIn PDF document text
    • http://aa-nusd.jp/3431883132.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/mizidavapa.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/42507571287.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/5521460478.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131b3edd0681---18319418336.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/12068416510.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c19f68c8f757bc2db5afc27db17baf88/gojubedezokibato.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/20279706442.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31260680835.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/nupalizenuto.pdfIn PDF document text
    • http://altus.pl/userfiles/file/30946249214.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613951a15f50f---3656902667.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/2559649166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sims+3+ds+romPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 10116 bytes
SHA-256: da9e67803f73ed4099168c962ca3785a24f8e9305a3be77d4f2d95c93c4c1ecb
font_01_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 20452 bytes
SHA-256: 4f1ea064f413d587bede247530034fb59188dfc0667411c2c7518fda825aa0e9
font_02_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1