Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa1eeb486ed1f87…

MALICIOUS

PDF

93.9 KB Created: 2021-09-04 00:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d4f63b5f2a07a4574225678392387b4 SHA-1: b267ffcf36303edf2d8185a128b50040bed55068 SHA-256: daa1eeb486ed1f87f391517286e1a1d1e9411a037061551275c5d579f843146d
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to numerous compromised websites, many of which are hosted on WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to obscure the final malicious destination.

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 https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b22a32aeaaa71ba7fe894f86101ff8a5/50354295840.pdf In PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/dotarazogiki.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/11512555517.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/34445574147.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/29167261293.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/7324c934da1e949dd6ccf9f0d0a72045/40805194880.pdfIn PDF document text
    • https://laser123.com/geektic/files/28371789565.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210821_03AA9081389C538C.pdfIn PDF document text
    • http://prograsifkalip.com/files/92047632101.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/wudopegoze.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/11036995596.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/rofosug.pdfIn PDF document text
    • http://ailizia.com/userfiles/21740011862.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/40743196558.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608204fca2b6b---64817479594.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607addd9c16bc---retixesitubalisovi.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/5293954998.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/82791156025.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/newuxarabulebadupife.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/it702t4l4u4ii0vb097s33hg7a/8865856676.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/jebuvetaluletizupatugel.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/35251893321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cancer+de+estomago+en+colombia+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_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 11132 bytes
SHA-256: 4114d658acb767ac9a90f03eb78ab626495b0b6daeee7598b29e9b5194a14d81
font_02_sfnt_off00013946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13946 19088 bytes
SHA-256: 3b18867424415961b278c5518b3b34194c34018e9f07ae1a93ff91c1e3b997f1