Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5b35157f327dfc…

MALICIOUS

PDF

98.1 KB Created: 2021-09-07 09:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03cc6f4f36e066d17477a1577d4d314c SHA-1: d368163f25d06e5461a51c8acc0d27c7157592a3 SHA-256: 6d5b35157f327dfc7fa6ae8334b75f1153b9c92ee194bbe4d100ca2e3000da35
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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
  • 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://advantagelic.com/singhania/downloads/file/sisuselobeze.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/46944388422.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/7900269726.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/87733275024.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gawosafutid.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da4be553e---sedosizogiguk.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bab109a1000---nafikugetuxadegiragojul.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160920365459c2---36786034805.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/tapawubixixikenonudomovo.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ecf1c53fe6d425bd6cf75299df651524/jebuvodulotufoguked.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/94768955583.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/gexukoz.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0d626adcfffd2b36e861004e87d5b476/xilimavemawarazalex.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/74533514562.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/waripa.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c79b0c5f98b---mezipejevidemij.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073f002a145d---57091087300.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/015e71a2f9c33ec7a4f80c74d04c16ed/16371624511.pdfIn PDF document text
    • http://djpress.pl/Image/files/rikivowitezirafaxinupo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084e22adeb3f---45088576272.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1m4a5hccpinu7d7uqu6tl7vapt/nuregukaxosuduma.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/beniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=traffic+signal+design+manualPDF 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_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13407 18072 bytes
SHA-256: d12ab7dfde8e671b5d2bdeb497f0d0117b26a12647cb63307d627b7d59145b36
font_02_sfnt_off00016320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16320 10664 bytes
SHA-256: 80f56dc60b1f6ddf142a1da6f15c8a5233e9d09f8fdc2b9eb243616acca77210

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