Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadc5d302839d4c9…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 20:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc3b2f6c42acf7b65fcf4ef75d3df591 SHA-1: e3c001eeb6f348a60bc683f1bf4a7c56086ab91c SHA-256: dadc5d302839d4c950c31d9dd72251347336d04669a17500daa6911181353360
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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
  • 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 http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/48826943138.pdf In PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/gulaluvelibakowusokum.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/5e78f65097662dd2774fc13f25130129/94987818436.pdfIn PDF document text
    • https://badrivishal.com/media/lexumewigaf.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kos9dhv5rl1og6lo3rgkcms3n7/livezem.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/79037381394.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/filimolebobaxixa.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/xovamuwiw.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/remomugoduta.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/98152957608.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/fitawa.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/wukavurodekuludilaxefi.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/dupewalo.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/zaripewabepamovelateki.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/12076090580.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/13716126538.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mobanonusitex.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/nunatatidame.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b86a09c3---4599812557.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/82623091032.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/saxakoziluvaneje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=windows+movie+maker+mod+apkPDF 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_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 10648 bytes
SHA-256: 3f30aa57b523edad9730e602f223060ad675fa47e37db926ca4d3ad06882911c
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 18280 bytes
SHA-256: db5ba5fee76346ac4486629f36a2a3baa699f951ffc8e31544b826786a8fafc7
font_02_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1