Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d134f72fdd1b16…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 02:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 66d7b16606901faf687966808d536351 SHA-1: 30928d7de8d30c00f15f2bef20c6bfd44ac46138 SHA-256: 05d134f72fdd1b16a35d512d04b9c503c7176bea99ca8bc1da308aef06123ce1
104 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 storage, indicating a link farm designed to distribute malicious files. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and heuristic firings suggest an attempt to trick users into downloading further malicious content, likely via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a230f75d5a---23459167570.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c5b06fe2---tedewa.pdf
    • http://samocvet.org/foto/ck/files/31785607189.pdf
    • http://www.toptehnik.si/images/rubikivub.pdf
    • http://douzonebnf.com/upload/file///fazezinonobek.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2af8346d8d458a60d5c51c8bcd589178/pimuluwixolojamobidad.pdf
    • http://bachova-terapia.sk/images/file/fopobanawiwega.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/m3dn0hkqk6chs2sle4tjj6nam9/76207812465.pdf
    • http://adaviestransportltd.com/userfiles/file/banolorifukozajimapawabe.pdf
    • http://akvaguru.hu/user/file/remofonezomugokisinini.pdf
    • http://szwygs.com/upload/24584302314.pdf
    • http://ehs1958.org/clients/73155/File/wobizumulexagakarabeku.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfdfda3701---341179940.pdf
    • http://bm-shower.com/userfiles/files/93039424400.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/92060457796.pdf
    • http://trevelci.ru/ckfinder/userfiles/files/50540917144.pdf
    • http://zhatuogz.com/uploadfile/file/47480374215.pdf
    • http://peoplefineart.com/assets/202107/files/20210714054547770029.pdf
    • http://statsale.com/data/upload/ck/files/59421275086.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/49190815a6a160f39e1cfef22559f60f/61880974509.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f06bb82df3---49518172529.pdf
    • http://ohsongpharm.com/ckfinder/userfiles/files/zabodireb.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d56695ace35d31e818edc5c45779a3f9/jidopufug.pdf
    • https://mogilew.ru/userfiles/file/volaputuz.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38bf53fb7---patotovibutebawidixar.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/20250389688.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/f3ff49255157418fe4e7c96f6360a08f/guniduxedadopekexa.pdf
    • https://allianztc.ro/files/file/sazufe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=batman+vs+superman+comics+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb47.bin
04eb25e9ba45e7bd352a1f36936eb6b5be4bf33fcf018eb1fb7df615559f68c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 17592 bytes
font_01_sfnt_off000118c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 16792 bytes
font_02_sfnt_off000130df.bin
9ddeba9cbe76bb77e8fa80e49617c313c962cda5228565933d5db67f285706c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 11088 bytes