Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9a3515d0ed3bed…

MALICIOUS

PDF

76.3 KB Created: 2021-08-20 21:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4f25ef19ad072caf8d52ea0e9414f9c8 SHA-1: 0a4501ff8a6138323bb12f6e28b9b9b8ef1cda46 SHA-256: 3b9a3515d0ed3bed2b4b8ae65baa1e3588c5602b8fa5f6288e1ed80f58249a45
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=recep+ivedik+3+full+izle+tek+par%C3%A7a+hd+izle+720p+youtube PDF link annotation
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/39909661038.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/36418343470.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ddcde163fdab1cee6797a103cbcf12c7/75046738324.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/84823c64d8b88c02d6d4d09b64ede007/fuserawedogenirarunuxuluv.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107160812251544.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f955c19ee4---34219238228.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/79164753199.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/7232053731.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160713409d6b6b---9948754016.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f0704dcc---33740556984.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160822f6f03dc3---77711062106.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f5421874f41d3575629cec66559f351a/7575137340.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/78049719617.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/rojuli.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/22763236286.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1bcc4db54113852de86fb7d3dc2a2f5f/wesupilavapow.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/71398472479.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/85108681183.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7a9aabb7---60893585685.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/26806959624.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/lamawoxiboxex.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/bofidivilezet.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610842bca96e2---24490680199.pdfIn PDF document text
    • 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_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 21804 bytes
SHA-256: 7950a4f449e4d17de7ad15c50b6f9684e7a7016eff3a9dfd90cc6029c67c825d
font_01_sfnt_off0001151c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 11724 bytes
SHA-256: f4f5a23e7302790f282bc727113b296d98b6771e0e5ce270fb94b5ee2714338a