Malicious PDF — malware analysis report

Static analysis result for SHA-256 991e3358289b424d…

MALICIOUS

PDF

91.0 KB Created: 2021-08-08 12:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22beda334c5fad5ab5f8df861f6031f6 SHA-1: 4954ed0d5235a927dae936a197fdd73d0e322661 SHA-256: 991e3358289b424d40785c3fc75989f3dcf6317926a8e12ae9fa947145362663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous external URIs, many of which point to compromised WordPress upload storage, suggesting a link farm designed to distribute malicious content. The presence of these links indicates an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://coretry.ru/uplcv?utm_term=how+much+does+it+cost+to+fix+coolant+leak
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c703d9fcc---33883433151.pdf
    • http://epmresearch.org/userfiles/files/37977721004.pdf
    • http://candybeauty.vn/upload/files/lefavumodumoku.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2mk8o1o5dsa97m3mgoo65jmenn/25508415000.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52b283d4ba---28982174162.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6389017608ee0928d297cc5ec3d1ab48/74372536085.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a9e9e8a94853344b56e644cfc1015831/puxepalakete.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2d9f3e77---serosofavunupuj.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3bc94ae6b32df50a21a9b068d978baa2/65499063596.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/66nqfmvemkmkld1k3map7fmu1r/panoguvava.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/96246002075.pdf
    • https://2acontractor.it/images/file/bodabogixinuxisosisojus.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/86369a687f074d21107e81d044586d66/57174619639.pdf
    • http://infrabud.eu/fckpliki/file/josogekixo.pdf
    • https://juvelyrikoscentras.lt/Files/file/14476737121.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/91e5db97537565251b203aec9a3c1e29/49989474076.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/g47lucpmhl28fmib4ec182pfh0/sebubukofilovowotukofufuj.pdf
    • http://bloemenwinkelindex.nl/images/uploads/73267063227.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/62632426089.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/5708542449.pdf
    • http://fzsvybbs.at/userfiles/file/7359529330.pdf
    • http://luluscafeonline.com/uploads/files/714097566.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098217c654ae---14369578881.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7e4bdce9---31902390681.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/31985090507.pdf
    • 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_off0000fe96.bin
2c1cb8e46e6109b7e6c3143a64151e0786abe019f13ca971c1913ccb4d417996
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 17172 bytes
font_01_sfnt_off00012b3f.bin
8946b1802844e6c14297a714dc832ece19079547b2d22f422e5bac41a2877da1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3F 11012 bytes
font_02_sfnt_off000144bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144BD 16792 bytes