Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd0d0daf0168e7e…

MALICIOUS

PDF

93.8 KB Created: 2021-09-01 05:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2d02c6efe4b4fb81264a844d1e1449c SHA-1: c16c34d5b1f96de73a7b0a187cb6b59cfb2fccbb SHA-256: 4bd0d0daf0168e7eba84899aab8d2293f9f26c4467f22c8ca477dcce30c8920a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://profix.fr/ckfinder/userfiles/files/10566784199.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a589d2d2a5e96e389b9ea9fca9104a4c/20302028253.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/mg6oqso3bv5cegv3m1qdvvt145/35905755505.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ae134fa71---gatepasog.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5257ba530b3b5effe21889424990848a/sakaxuwafopifiparam.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/rivemamamagena.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/xuvalegalafudiwizuxawi.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210816102714_umlbi1.pdfIn PDF document text
    • http://naviway.su/upload/files/xepigidetuludigetipi.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/769a550fef2ec975298027458ea98106/22061728656.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/80390798437.pdfIn PDF document text
    • https://cargobull.cz/res/file/berugitefixenezegozija.pdfIn PDF document text
    • http://faradbox.pl/files/file/mavelejaposadinowukuvu.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/muwowiwimosesikenu.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/tusalolo.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/24636c414b914b4c8f4ecdf122a4086f/sasegebafako.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///mawivuk.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac5361e56---93684416771.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ea30104c---53542804656.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/84315116755.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/pibefubexegovakojuk.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f0cd7fe5ebc46af427a1fb9585b5d5d8/vinikokusuwede.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/50827297311.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607dac9d6903d---93142651683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=one+light+year+to+kmPDF 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_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 19448 bytes
SHA-256: fcfb781f946135c470476b11cd8035367d37adc6b16d271059effdf9784d0933
font_02_sfnt_off00015087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15087 10620 bytes
SHA-256: fa4e76480d38bc4e13e8660795e863c06dadb10137bd71deff8a2eb4f1796218