Malicious PDF — malware analysis report

Static analysis result for SHA-256 391af4342f279248…

MALICIOUS

PDF

95.1 KB Created: 2021-08-09 19:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6dc31d1b6395ce06cb3f5a911ff9a7ce SHA-1: cd97d89b72dcbfc6fa34c9bb42b7e8d9bcef378b SHA-256: 391af4342f279248a3ce59f33fd65017bb88d862cb312cbe9d7f51aade1d0e7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns that leverage these link farms to redirect victims. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://commonlawhouse.in/userfiles/file/lexujujaxadefak.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5b0a3a29fdb37c654e9fda28bb72622/58740503215.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d24caf8cc---13597630876.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/78161192104.pdfIn PDF document text
    • https://khanikango.in/file/zuvasotuz.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/2fd24e27a8325978cfe06e4d8b64e371/49915968040.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f5e43ede569cb70a00092d5b3e92e912/gilibabosorolobubi.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/fepowapopuned.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51164061c---37179133179.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/71038368970.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f4614c66---kiliguvelojizexuxufixenig.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c60e1229854---wameluzemijoludigiwixaxu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/90161369556.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/41382594252.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/20805172440.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/64a669c5fa14c305cf1da1c9ac6f6660/51495444797.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/47683033996.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/57827349472.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826b0ec8425---42539500407.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082132de87aa---digalibepebatex.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/bd043719839474ca45a95fa9c0c89d3f/947870089.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160be33dddc1d4---kitezixosotebowupazor.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb150fc63a4---65621806203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=possessive+nouns+worksheet+onlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 17588 bytes
SHA-256: f5fde204e157851812a9444b1c8c91c3180315587f089a797fd8700902894bd9
font_01_sfnt_off00012841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14052 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000155c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C9 10388 bytes
SHA-256: fa778fcbd022c11fe441b74bcb13a7f4fd8fedd28680ab46420ecc4d006b17c5

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