Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfae45c3aceefb6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 10:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 332b5092b34740fecdd3ac78bbaac96a SHA-1: d7f7ffff1c7b7f65b93b53ebecd8df5063a10b76 SHA-256: dbfae45c3aceefb6bdf5fa95f2293f8834d0fb63f16a95518430a1a2842b1dcc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many embedded URLs pointing to external sites, some hosted on compromised CMS platforms. The primary attack pattern observed is the distribution of malicious links, likely intended to lead users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://razredna-nastava.net/files/52087643685.pdf In PDF document text
    • https://stancijanegrin.com/userfiles/file/vigiluwobirapewiroj.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/riguvegu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/mupovinixaxegunogawu.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/65592118855.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/06d9d26f0f9072c07f0eb70407e016d3/20167918047.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/9719a9fd6c4cbf97e94145c9ea09a9fb/5765874675.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8joh7pm5nula25rdejtn19dp18/73483662807.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/46427843162.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/12110560636.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/devakot.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46163e5148---18875834091.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b378c7ac88---nojipedejijuzulexo.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210714_4CE2A15FC3B29236.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607135c2496bd---dadusoratavawegud.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d6da0ad0bf6df8c01c5a474b2e86b6e/39805234346.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/57358049868.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/kanupasefakodomeneja.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/vedaxotoze.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/wawamokasuw.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/zuvaxamut.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160730e03c7dd1---94252064579.pdfIn PDF document text
    • http://bscartridge.com/pic/gibafedaxeseluna.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacd881853---mupogof.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/10279456161.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f90a807e36c---27670945981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=social+justice+in+the+book+of+amos+pdfPDF 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_off0000bbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE7 15908 bytes
SHA-256: c60da6ec4cf3c2bde5b718133b3b5ac668aaaa0adf6bebcc9d88e8199e731ab3
font_01_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 11320 bytes
SHA-256: cf8328bd376bcd1ed754738c99852cf0fb922e63cde9e0b7332a695188dab160
font_02_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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