Malicious PDF — malware analysis report

Static analysis result for SHA-256 56741cc7c4a04030…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 13:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ada4066aba4e8338eaa350ef5107ce79 SHA-1: 5a089929ad2cd1680813b325f045b6f385c305aa SHA-256: 56741cc7c4a04030b8ac11ab96d34f3697df7f59c172819e5b19a443ba3875f2
156 Risk Score

Malware Insights

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

The sample was identified as malicious by a ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://udelimpa.es/ckfinder/userfiles/files/dewaforoserovalex.pdf In PDF document text
    • http://klaaswester.nl/img/file/lafutoji.pdfIn PDF document text
    • http://standardamulet.com/files/files/34502288217.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45bfbc91dc---lazofujuzebanuwevetadim.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/23133862793.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/fadenabefeniropifomezera.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/ruroxegupubapigigivuru.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f71fdf912---88218743715.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608756e3ee195---mopimuwezisudusog.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/954eef70b470aca5827c0a4bd4ffb038/46332255198.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2cc75b4e---1930738501.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/34026171332.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/xenimorexijikitoduzojip.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/32878260520.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/76179628785.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/kuzovifogexibe.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/91785749381.pdfIn PDF document text
    • https://chpcentre.com/files/file/69783164749.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/6ta7omac7644gfbnv4htjmeavo/fakimukexojozuzojadurasa.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/98273045863.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3ra13flvushvi2m5fs8sm8b0ie/95499265015.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/wegeb.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/40118340837.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/89306046739.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66ef0850a---2594211613.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/mumego.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/72545637812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bmw+e46+m3+csl+manual+for+salePDF 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_off0000cc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6B 18476 bytes
SHA-256: 1b5bc9decedaa18218bb72d7aa2598c060004086466103492dca79a49b952c60
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10964 bytes
SHA-256: d62d2209ceb89076439c9c5b6adfed485f0f4022f7dfe5112d08a523bf5744d0
font_02_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1