Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66dc8873d80ea23…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 06:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8eba64a0f1bbbede8b9b0625fce6410a SHA-1: 951ec51951b212ca30f3ef079594ea2b16831d04 SHA-256: f66dc8873d80ea2332e123eea7787a662bee3b71ebbc5daa99e6d873ceb7636e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://adsbudget.net/userfiles/file/dafigejoravorel.pdf In PDF document text
    • http://wittlich-luexem.de/userfiles/file/jedawuguli.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/otv1s62av51v1gn2dhpt2jo4bg/87833596041.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/vofetagafoduvi.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/78225840628.pdfIn PDF document text
    • https://marosme.ro/hirek/file/97784222435.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9f74dc56---nozalon.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/bilitexakudezoliju.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/819ece3d7637b7538f037658acc4d235/telafigaxugejaganej.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vufimedakival.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5bd6bacce---53815670900.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcedfe6bd2---losowugusuvogomumuje.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/61484913789.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210801024530_4aa1d5.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed691eb4d8---bawolepuxeku.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/12qae59fojpfee858pjad3vbvb/46661362068.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/45563185881.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/tobez.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/44255142341.pdfIn PDF document text
    • http://regcureguide.com/files/files/regurabuledenasogexajot.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c581353e2c9b6966e4446c5d0002db63/97788925603.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/4250375548.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/mifevajegunigaredunogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=is+the+merchant+of+venice+a+comedy+or+tragedyPDF 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://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_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 11008 bytes
SHA-256: 9709212a4fa0c7bca29899a25ea50bc692f60c416074e2da55bf7403fec14756
font_01_sfnt_off00011401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11401 17628 bytes
SHA-256: 80ffcfb448f4ea24c4496d7ba544a695cb0f9c95ce684bc4c51b28b7911e402b
font_02_sfnt_off000141af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1