Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2048d722b64bbc…

MALICIOUS

PDF

147.1 KB Created: 2021-08-09 06:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 544b0d43531fb703cf12f93933c34a84 SHA-1: 420484847e36e8f2ac2d67bb9aa9203f2cfabb80 SHA-256: cb2048d722b64bbc5bb9a958ebdbe800ec0cc093592e2c7c3308304deafb2ed7
154 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely to lead users to phishing pages or download further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5323

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 http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc376413fce---52456538760.pdf In PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/pebuzamawe.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pofoki.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/87904065675.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6c4031d959dfc74f98f1b7d84c453d6a/sapubakulibuwubogobubife.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c5mrblkfomuflag4fi00kb4338/vifixogejive.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/87600665487.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/27958705209.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-29/20210629110624120297.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/kedidabumotelava.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/784014289.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e68f116d3---70980044169.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/3t9ftln2225msr6k72s3gup704/88348086145.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/33823707018.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/80833090296.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3m6r8n8drpeekvf3bddhqssleq/pasirolijex.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/lopejozukamigavaki.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/jigetagu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/nuxogiriwo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210602/210602072402290604t46nj6zjoiir.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/38353260688.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jajigimilir.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/jiginejaposazilonivaz.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/97889471963.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8bacda51041410242a9db2c1512ef7b9/57837222018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=halo+reach+game+unblockedPDF 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_off0001f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9B1 18244 bytes
SHA-256: a07dc8f7c890f9e10c390060d446995bf7509e788a8eed14e20b19bf293da88f
font_01_sfnt_off0002296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2296F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1