Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad303b5e7e11ef8…

MALICIOUS

PDF

91.9 KB Created: 2021-08-01 14:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c02475756d28ad37eaa44b70a2d8018 SHA-1: 235c6754f60baaa4b79369151e97d77068258559 SHA-256: 7ad303b5e7e11ef8adc8fabbe63e265fa91afa996e90a69c547158ed77832883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm used for distributing malicious content or phishing. The 'web design proposal' UTM parameter in one URL indicates a lure to entice users to click on these links. No scripts were extracted, but the presence of multiple external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bbl0u4tv9o7lsfkmoh3o2bjggu/20947270496.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c388724d03d---komilejijejow.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/49316919016.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ef53268c5d0eac0b476f18b00f79e5c9/54573077530.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/kizojinopotixetizorufiwu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae25c862b---sufovedepajefirakimanifo.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f529d7e59c34dee0d99b49b769242a90/nufavubefoka.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/4d32527e2499a1df6305b062c573f605/10601129489.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/nivolirodowijurozokofew.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bf1c653ed---25819944362.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/33r635bkh5a248e9i9v8nmt894/vowusegekufiniranofeg.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/xomijowizoboregifo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced7cc5ecc---jufisojakimibigatenumitad.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/8403974644.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f823c396e306d5d9697fc46e34375f56/94205539993.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/virakapoto.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a521e6c4---suparexigideraxafonuve.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088afde289da---wetevuvedaba.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d03ee8a5dda56671beccc315ee09fce1/11754430844.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e322a54b---82092321948.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7favi1dfuaorvjqq5ks2kfe21c/21218318818.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8oji8rgg9lku0aio5urvekuq51/xuwezezobifogapewubavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=web+design+proposal+word+documentPDF 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_off000103b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B5 11176 bytes
SHA-256: a65bd7170413b23c3ae079e55d29533d24b69fbf16e02e03303ef573549f0d04
font_01_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001358c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 16568 bytes
SHA-256: 6b80557d36cb7c2f07f77636ab299b0ef798acb115c50e9ad81869c33cbf7f6c

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