Malicious PDF — malware analysis report

Static analysis result for SHA-256 a481556a806f3f09…

MALICIOUS

PDF

105.1 KB Created: 2021-09-04 13:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c04c70e34cb055f397820dd64e6b46c3 SHA-1: 58f4bd4898cdd3a322b20d0793e3638f4f0de41e SHA-256: a481556a806f3f0980e0791cf1a314edc119f8bc5d2ff5e4ba6d42ac05011156
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 external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/uplcv?utm_term=advanced+sigil+magick+pdf PDF link annotation
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/ledizewosebuwuzube.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/3114922715.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4ec6f13bc18cc2a7dd87db1911465aab/nejomenoxekawal.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a614a832b87b800df703f4ec49b6e669/piviwik.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tuladipagilaw.pdfIn PDF document text
    • http://demkapi.com/resimler/files/mozeduvutegaxukadadefit.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c21cd0748a2dfd9eb5f7d623cc3a298e/94792620864.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a73a2f3fca8a92250408ff84983aae17/jamivufoz.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/pupepuw.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5399cb5027e621635253378641442ad9/kanurupufe.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/kijotulimoluponute.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69230a3f54ec26de09d525d11d8ad761/padukadenemogu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d26acdec---50502425055.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/1499746135.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/2774737793.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903120123160.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/10120927868.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/btujfjficrni8hsr7plgbl662l/23795893835.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_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 10784 bytes
SHA-256: f2bad6c5df569abc250f3be8f54cd76c2225269bebd708e2ee9b7490b5f90b93
font_01_sfnt_off00014afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFC 20540 bytes
SHA-256: 22af23ddfb5a7be5170156ec5ddc16545d8d196348ed577313ab18550386c077
font_02_sfnt_off00017f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1