Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd61c9f5fac7f398…

MALICIOUS

PDF

90.6 KB Created: 2021-09-07 14:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e48f8a47d6a521f91ab6affeafb17b8 SHA-1: a6abfc32f4801238d1a7c6262f5aa0f29d7ae75c SHA-256: cd61c9f5fac7f3981bab4497d2fa6c09bc6f0b093ae1d4b989fe2c4eb3a39ed9
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609874326dc3f---70184993839.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161086788aab7a---14178292773.pdfIn PDF document text
    • http://meta-min.com/files/86341559444.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c822bc3140---lekokubijire.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210624_091402.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9ad29cb480d6d35ac498c0c704980ebd/31940253322.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/63547167083.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/60552343281.pdfIn PDF document text
    • https://marosme.ro/hirek/file/donowiponupolajuzizi.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/66000402983.pdfIn PDF document text
    • https://promise-land.com/upload/file/xovubunawugega.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/86267858903.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aced0ce45d4b5f74021448ee0316dda/56860420479.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/pufebat.pdfIn PDF document text
    • https://afayl.com/userfiles/file/xubawok.pdfIn PDF document text
    • https://signika.pl/Upload/file/14208872214.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/nibubipareminobipeloga.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/eade6d65ab85da0d9c769aabfa37f543/32391240589.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kbaedk2idbu60l4hpvmgschfli/82375826904.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/tukunazeselawu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ffffeccbe2---31326621959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=osaka+amazing+pass+pdfPDF 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_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 21280 bytes
SHA-256: c73ad1ada390a276fae75a28dce9f7bd6d2305d57540c82e930ac60a243c2f11
font_01_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14546 10524 bytes
SHA-256: 546a324f98365af1862372cbb71523c314bace9df4b53cec0e84fc5495179e56