Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f8a3de167fecb1…

MALICIOUS

PDF

66.8 KB Created: 2021-08-15 09:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d3af44ed36f7a1ac06657d5a9e25e8b SHA-1: 0e4afaa8b479d7140b7679fbf5b2edaff378be8a SHA-256: 08f8a3de167fecb10b75b567fa34b2a82ddfa7206d43b448645f24319a58ef47
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9137

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/aa7241e8a3eeed30a3457edb3123c3f1/xosat.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/76284dd82b583a4f83b1038dc2a953f1/80004987801.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d6d5b28cedfaa5e90662e32c04961438/19668549324.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/deritamesekafabipo.pdfIn PDF document text
    • https://bioesteticaonline.it/file/vegijefejexedetijazesugu.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/jasirutoved.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/voxudilomerewoden.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/6108989375.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dad926c9a6---vufatinelanoworofexagev.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/631144343b72570ade3d9b68d5cc5c52/rupetafirufewuganonunog.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/lumuxofedonurobe.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/82603451524.pdfIn PDF document text
    • http://praguetransfer.com/files/file/14509977608.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/7529dc4100e8609351591b1ee495fe79/81870944966.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8766fad9f3a55f20326fcd93ca36431d/jovidukofasitoje.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b866852e997---1874114849.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4cc7c489---rerudosekovunapan.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/87895940402.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210719/1857502728.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3af62i3ip6o2khit34f89a3klb/gugutitodil.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7061a5522f---52704685016.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/titagirasanakekojalapov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+to+write+in+the+performance+review+comments+for+myselfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/7557302810.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 16532 bytes
SHA-256: 343348917c73d104b0c07da9c13c65ea00f80f29c3f7c624be6679eee2e6c90d