Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba10ab20f5a12488…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 01:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f698cb77d6017446b5868317e430da40 SHA-1: 9c9e9a586fe36f5e55f3a7060fb660f1cdeebc5d SHA-256: ba10ab20f5a124880517167114044fb5e54b70575ef3c78b73349541168b6c84
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alfavs.eu/userfiles/file/nirawuxuwozeginevenidupo.pdf In PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210730200824.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6e5689b02c1fb667d10904f84ab1068d/xiruloburolawutodavikuler.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/20598029149.pdfIn PDF document text
    • http://thongthien.vn/upload/files/44870454848.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160857b9ca2c4f---43550465954.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/35932647697.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/88dcf7f47a2777c0e2c5ce7c2e5ced67/6679467819.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/decc1f3167eeff15dcd3e9d4aa01ca60/zitowateg.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/zijemukixumi.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dfeb1adfc5e---99835511606.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zupepitopegalozafixukib.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a47daf179---65183141696.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/157a31a69e4ee48c864190350a2bd7ef/13246340771.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/18128586522.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/2876865480.pdfIn PDF document text
    • http://geose.ru/userfiles/file/pexidibutugunudefi.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5msjm5d9sao32mu5jmrn5gr866/97804939561.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/zekugulipuromuxiwilabe.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/pefapokejejoginusos.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fdl65l60u4ai4k27an8pa7cdh7/41723632312.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd3f563a8---giwiretodoxojipulufod.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/6332347111.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/lizavudafawulepuxedalabuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pews+score+chart+pdfPDF 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_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 10560 bytes
SHA-256: acb4d0dbfd1e35081ff1831addcddf85426e20a2b26bf0709ad33b4b4e87017e
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 17700 bytes
SHA-256: 5e9cda33fdea3d65dc6dd94aa0ead45cd8e597a2fc705f0b73c18496e3b0209e