Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c1b7947d3eeaef…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 02:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f77477f878e6f374a8b0f461f42b5c22 SHA-1: 3d2e325dfa6e800a12203a6af7916ec1fccf8e1b SHA-256: 84c1b7947d3eeaef103d09fe013aac2c409d208e7d88990d96d9b1beb71bfc66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f10edebfc5---jonatotam.pdf In PDF document text
    • https://www.profiemg.cz/upload/ck/files/44261037466.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210819185310.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/deb32995a8742dbf41431464ecbb859f/joralimowise.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbe09209c4---zalizekosofatokalesozodod.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/25b3ec88378f09e52fba7e77431fb7c9/38186372909.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/lelitebogejofezos.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/rawukiwopuvoxawopamad.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f3b44fbb---magibipig.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161005a7788ccc---1471381615.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d54f642b8---vusibatiwuvilajebi.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/rejanoderiwuzovebajuvin.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/tq2ceoqpqa85spg6n2jds0c785/96117281824.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edb3281327---52125135741.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783ef1b863e---gikojefotivedesekumadefir.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f01d3abd---77029458389.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/xenalobuvudatumu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942fc981caa---17746335749.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0f20dad9---xajakibavelilufur.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/texasidepirariwiril.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113dc3c5e310---63583818302.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/01b575ba383a62e6dbc67ddd1c246bd7/fatikelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2006+chevy+trailblazer+manual+onlinePDF 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_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 11120 bytes
SHA-256: 8943c01f70b7643c42e04e6aabd63d23ce698493fe7d49efa5629b27eed96ed8
font_01_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 16556 bytes
SHA-256: fdb933e852891af5832d2a7e5d0aef246b3ce80355f2314cd333c3e03b3d5b14
font_02_sfnt_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1