Malicious PDF — malware analysis report

Static analysis result for SHA-256 c842f4a070a359d1…

MALICIOUS

PDF

73.5 KB Created: 2021-08-25 01:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 351934726a6407b1447c5be37fa3ad0d SHA-1: 5ae01b3719208e6316adcab7057c49cf26ec41f2 SHA-256: c842f4a070a359d1cc255ff45df38cc1dd3335f55b4b93107b2d63d8ccbd054e
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5474

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://aapltd.net/userfiles/file/90974042461.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914da669030---wemabuxakebu.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/bd1e5f9c4b659230f158ede1a1420ce3/rosojaf.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/64e17c9fc3bf5b6da677f18df8233ca5/39564390108.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/o3a7h108ft825i7qmkidmhdsf1/zutuvuwisowogikatigobuk.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0b0d0d90e---zozogunoxusadikizinofapu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/vgek8fvcdk9778rpvjooudppv1/mukelonodikos.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fibeferodobij.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d76d8a536---4664967772.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/kirenorozivezilemid.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1610f130e4f79a---70050073066.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/29772940954.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/o0tvgjouqes2fkb9lha4m74nl7/xomozosod.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/22696428563.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30536730c---89777557651.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081088b3a875---82524369240.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/85ab535874adb860c0d0d12e098f873f/45565790271.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/4f47816b27267bdbbe773bf3dfd79e85/76571371510.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xavufawenojarebigan.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210816233056.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/rofopuxuvifiriladurud.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/6lc46i2kflgpto7sdt1aqeir6v/vetobubokagub.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/20791a9d5e49e9795b362b79b6333356/fanifigifojuwit.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ec30f04---27857608779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tiger+roaring+images+hdPDF 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_off0000d455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 10516 bytes
SHA-256: a610bf71c119b06da7f69dac2a8ee5e09407540db158dbec98463e6b3c8d9365