Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b840f55d31586c…

MALICIOUS

PDF

133.1 KB Created: 2021-06-20 12:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0bc1bb82100ac57670de528ce7a38065 SHA-1: 0f822dbb3a9fc9b0e308f2078385eb359549283d SHA-256: 58b840f55d31586c6457a2c318d6925d51f6b1ccf7e423f29e02b58560f54f1e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/5ba27d2ccccd28412c29d3be0e08a4dc/lazokokugolazuginede.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa951240f---78963686564.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/agp1e8o223dbnoecd3hj9qev96/36524429927.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f8rbafqjel10onthvr2vd28of0/35634156295.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ec2e4688c018bb5dbc1d7a90c7ae10e2/11265140461.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608202c32919d---tuzekafatibezal.pdfPDF link annotation
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f236323c6d55a336a04a8ad166f26a8b/sarevejatibus.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba47d63d9f---62684388721.pdfIn PDF document text
    • http://humanlitech.com/files/files/gitasarogiboxuxapeje.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/59847750091.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609797e221416---nusizepibegusob.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ac9f13108---nowibasalipegekide.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/28575163085.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/97066329338.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b8d3f291---54600848821.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/22158887641.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082d606146fe---83464585976.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2267eeb9c32dc4d22084443e3d647c90/8362937131.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+intelligent+investor+pdf+in+banglaPDF 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://scripts.sil.org/OFLIn 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_off0001afde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFDE 5452 bytes
SHA-256: 6382cb6a3d6108a05ac94f9b917e740047b113ba586a5c8ff8478686babcb250
font_01_sfnt_off0001c266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C266 13440 bytes
SHA-256: 0f16c7e125e94346c6f3ddf2fe9a916919e25f681bb68ae18335cefb140f3c64
font_02_sfnt_off0001ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF05 16184 bytes
SHA-256: 89c208c5973a3c695bba959c66362a10f0c6c59a87e6967c78d3dea7ec8928c2

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