Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e3d7b8ae368fe0…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 23:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eff0069253be33ec6cf4c0d9ab2ff962 SHA-1: fe8c499c055098b6295f3cb362e467959ae01e37 SHA-256: a4e3d7b8ae368fe0fc372b3a2abddd907cf914650feb099fe04993edfaa3afd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute phishing content or malware. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs strongly implies a redirection or download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://oniceh.ru/uplcv?utm_term=endotracheal+tube+is+used+for PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609725117e0c3---kodikozoto.pdfIn PDF document text
    • https://dm288.com/slicice/file/25811403494.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/181280788.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/sunadusikibivoderajojizer.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e2337ccc4f842f6d2ecd7c75e6908494/53415508836.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b754ddde759544d16006c9376b8b6f65/nimetamov.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ab34a927---28298532573.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b732e288dae---31536968966.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8ee1102c68eea1c68e83b7f13b38c79c/famumexubuwak.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/acdd2855646f47aebf666fb851cfb8b4/vemuduziwegujupe.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/firojetudozufu.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/86220896781.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/taviwutalejegesiwaxad.pdfIn PDF document text
    • http://aimic.com/userfiles/file/20506443303.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081711e25e1e---12444158887.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b992e9704ce---97019018639.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e0b8a6c8e35728ca3862c3388de94492/jugapugufanomedipifizuken.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd5091b0b---5323286411.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/1208828973.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/43788460283.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/j4o452aujggc0v6opsbces34g7/14149688854.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/vatoginazimazof.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/suwufogonasunezozotapizo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fac0ea094e---50508564542.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1652148fe---13585268055.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/waturo.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_off0000ea0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 17000 bytes
SHA-256: 185cc26532ebcf4d9e98f8901803873b2ea1e9377a6fed229b4c1f34408cdb33
font_01_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 10796 bytes
SHA-256: 890740e094744f3381b785336296d11dc2bf202251813aa0c2d193e6ae8e5eba
font_02_sfnt_off00012f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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