Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bda46c9da0bd77…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 19:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: fc73ef00d9115ab26e98c51459cfb944 SHA-1: e1f52dd0aed380cb319bb409d76b4415e87f9824 SHA-256: 79bda46c9da0bd774c5a313e91e6480443487c9b7e84a7983b551999711da19c
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b13d90b7d00---jasawalebinokaw.pdf, are indicative of attempts to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ntwbearing.com/UserFiles/File/52981165020.pdf In PDF document text
    • https://senhewood.com/d/files/panav.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/linugevajikoriwokofavatax.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/530672abe528baa738395baf1c8eb127/13474945726.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/93363916533.pdfIn PDF document text
    • http://proxima-design.cz/files/file/pekebapobumogiwoge.pdfIn PDF document text
    • http://askort.pl/Upload/file/32131193898.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/fi5v1i98ot8lpbukn0khg01lq8/rufatakuwuxevezoze.pdfIn PDF document text
    • http://abpaluso.com/upload/file/diremovif.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/xuxonikoletarawobulebed.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/86162470897.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/49861776883.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088761a344cd---minobakura.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/goruz.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1a5353793a5aad7cad2b1b1d4f802d17/tizifabofebozagavo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/71292656802.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/67091989875.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b13d90b7d00---jasawalebinokaw.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/76761738901.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/33871713030.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607117d4a57cb---vuwunonekajaselewufavodam.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fee2cc73f558d0bec42af3b88a5f6789/2351269784.pdfIn PDF document text
    • https://patc.fr/imagesfile/57909924021.pdfIn PDF document text
    • http://intergeored.com/upload/File/lujijajoporejedusujew.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1cce4452---25177805353.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/79185793144.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160874ee72b0cb---volil.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/094e3f800d7223000d90c924f873565f/womekavafebim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+calculate+phase+shiftPDF 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_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 17604 bytes
SHA-256: 03906ac4fec87a109137171c68a589eb82ef9a936eeb1458a9a60cad5117c3d9
font_02_sfnt_off00013994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13994 10804 bytes
SHA-256: eae41c48ea21c6d76563c823bd2806b802c3f0175da8a63f32b261044e6df5d1