Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0db067f7dff7717…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 14:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 949b82bb2d9d3c274a0c14e24432ab13 SHA-1: 13556d726d1be1b53becad0f83b3433f713d6374 SHA-256: b0db067f7dff7717bfb2108810a3825561c0dbf6c1fa413da5096f3b1c350010
156 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, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of these links indicates an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2b188fa0---37325766365.pdf In PDF document text
    • http://abwgulfport.com/uploads/files/32978242029.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/judirurutugexasi.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/sanamojezibirip.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/fa72d47a3394c2b83c4c2c0ba38fd88e/tuwurukezobedunototupej.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/82720032137.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16087741770403---rilebujaromojokewenunuw.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/tuvojepadakumogug.pdfIn PDF document text
    • http://djennebeads.com/nbloom/fckuploads/file/gegekus.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/jokizudaredisikumadonud.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4n8t8p6oht9igli530tp4j6rka/12270588651.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e9681373c---piriwulukajitaxil.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071e423cfe1c---sedomusovipi.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/82673749396.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/27030954102.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/88886886615.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/latebo.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/rivumajeg.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f9a43d8f1cf8d4cf542fc715837d5f86/70436404521.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/riraxilagiludixetari.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/68866184687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nissan+altima+2017+sv+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_off0000b657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB657 10404 bytes
SHA-256: 1a94064adb1157c8dfff0710ce161526a132c40a2e618420024cf1a2f752e27f
font_01_sfnt_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 17264 bytes
SHA-256: 6f4b925b9c56a5dc5628202653d4d8454e715d6746a3800ce967ec626c6c3500
font_02_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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