Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea252f4c7533d5a3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 15:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03f5f9b4b833e110fc8d3591cac348f1 SHA-1: 334c851a04025ba75e22473d56bbe2e26e072cf2 SHA-256: ea252f4c7533d5a3ed1fe67bedaf5fad6f6449867273ac185dc884c7207a6a32
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to compromised websites, suggesting a link farm or phishing lure. The presence of a visual download button further supports the idea that the document is designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=go+keyboard+go+keyboard PDF link annotation
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137451117307---gunenidavow.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ed1e8e4c---34067432407.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/34114726612.pdfIn PDF document text
    • https://keongracun.org/contents/files/koliwodixofisijekovoniw.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/14413025784.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/66862068934.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/83118620480.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/xisivoka.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/43908042324.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/64865633657.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/juvazimoki.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda5d7c1fb---dubuzikekewasoneboku.pdfIn PDF document text
    • http://handgun.ee/media/file/76828710321.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/gajevejipimiwuwirategoka.pdfIn PDF document text
    • https://hinaweb.com/upload/file/20942314033.pdfIn PDF document text
    • https://dcimx.com/files/90543329237.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/26183524575.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/24649984308.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/mibewivinobibatibub.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/torufibimosoberofol.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/loburagajelazi.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/dalutiw.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/gewor.pdfIn PDF document text
    • 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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 10300 bytes
SHA-256: c7d84dc3616e279b9722f1d690bb7db0b13c79a405681e4d40ecbb413754e883
font_02_sfnt_off00010a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 18564 bytes
SHA-256: 57c10237d386d2bc2dc1789ea9a340d0520d60f52ab403d72ae76fed8049eda2

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