Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8426ac3c61cf307…

MALICIOUS

PDF

78.5 KB Created: 2021-08-08 00:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0779061c416d4859f57993800d0157ed SHA-1: 3d1f5adc4cb2086abe8491939641eada5d40bd01 SHA-256: b8426ac3c61cf307281cbb97fb0114daeaf1d7837451286ef79b8ac9053a21e9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified by ClamAV as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures to trick users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4611

Heuristics 5

  • 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
  • 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://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/90f5d92c4dc7f82d85654a4e36264d57/25313237904.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160987d25a3142---83346765497.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cd4352c5081784f7e52f7b30d81a9ab7/16608470641.pdfIn PDF document text
    • http://raczcsalad.hu/files/45112798149.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8971a6e1a7---43227248730.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb8a653b8---dobozor.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082834b6a749---rodovexipotarip.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/16652822527.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ps13n50odri5c8so27tab2u75e/vinujizewe.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/xuwaruvasakukosulodomu.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/36276718527.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/riropopufetaseno.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eac7c153---kididuzitobiwovanil.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b7c42c24---11311959477.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ha0ic7c8asm6m0lfgq1lg6fjg3/sirave.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca973c05d7---38974162642.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/10158899251.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/cacrcuiubbb50lomt0bqm5nqo4/xojozu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa397ea8e---ranaxakalisoponusup.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5a6ad48d52529dfa51177f17bd50daa5/disifak.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0f0e514be690eb65854f70f9e73fdb90/xufaneze.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/zajosixowefakixinapago.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/35760920943.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/mutesirejegup.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/puwikidoja.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/fodukuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=machine+intelligence+demystifying+machine+learning+neural+networks+and+deep+learning+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 17736 bytes
SHA-256: 2ffb4b43a4ef31e740f1752247095fa8ca1f297a316bd1e8029a7b6eb4edea71