Malicious PDF — malware analysis report

Static analysis result for SHA-256 773419f211ac2bae…

MALICIOUS

PDF

84.6 KB Created: 2021-07-09 05:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1b845bd4d1ba7edb595d8552d202a88 SHA-1: ba7ed671fd0b1d2cc98ef8895490e29d52c11800 SHA-256: 773419f211ac2bae8562651d2df436c516c6c72259b9a0189dfe0ad93be9dbe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/049710bf411ca6ad05e48eb0d6a0fc00/zeriwobalanot.pdf In PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jawamimuxelajivazifo.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2aaf97ac65dca5669ddf5358f3b5427e/81919825675.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/lifavosipigojizazupe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefdc733166---40401407400.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b499623ccba75e28cb0debe7ddb3fbe7/forufarokimaluvi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfdbe0d1ff---fopapetilini.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160878ae18ea8e---28943803481.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/58628400978.pdfIn PDF document text
    • http://moristas.com/userfiles/files/munatulakojolawofi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f30055ef---78127775352.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/05caf5d462ae84263af31ff7e5f6ffa9/13000166583.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/11369913209.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8bd6cc2f3d5ee684cbc72d25f04286b3/67398604901.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/518955b8e62b284204b6c8fe598e1912/natafi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0c93e988---nobexipewumupinodawolaxo.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607796a760eb7---ludoxifuxewuso.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aba04e301ac---73515799129.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/9623435085.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/96700429163.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/mezipemowetaribuno.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c19f587b24269f9dec061ef9aa1f8936/morawirabakagukivemobed.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/41428909059.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/0102624b2a5138e0510213fba0e29a92/27893899174.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/66540119519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=red+mark+on+baby+backPDF 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_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 10520 bytes
SHA-256: 5507b09af5b725f57ee3abd8beb8ae8c5fcc27d0b5c647bb653c6df6a783e8b1
font_01_sfnt_off0001040f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 15992 bytes
SHA-256: 419e957c6f04351e8845635b1bf1057575d7ae49b7997c6889bfe42b96c193c8