Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e09ba81c5182fbd…

MALICIOUS

PDF

93.4 KB Created: 2021-06-27 07:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 350b38ae9546b9c8bd0fdc8aff497766 SHA-1: 9523f9747a4b18e6e9a35fe4b54085b36add8ef3 SHA-256: 1e09ba81c5182fbdd6c790262c7579cc6327a0dbfbcfe5a6318731da7d87f809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://huntic.ru/uplcv?utm_term=miss+marple+the+moving+finger+1985 PDF link annotation
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80a41a382---10036600251.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071f86c6e975---81667248582.pdfIn PDF document text
    • https://okvino.it/file/91124842196.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/v5ps7ko1hpnt1pbutqhn8esljn/zizomiwaf.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f92a9f95a6b73f9c1f0ed31dc6b564a6/55094083677.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/mfog9f2r8gh01ucecid2ih9q82/41649143969.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e8rohj0guru49c8tkvo59q71qs/ruxotekumileta.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/lizonuwefewogekazevana.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ec4e5c7f---13902545895.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/02c685a3e3c212eb8f8a010674edef30/fadisototab.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae79790bf---lamaxazijexomemotixevup.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/8bb6d10b9615a40fc4bd57907e2d398e/bivupi.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/okb7fkbr9831795o5oml1n1ibl/90252841569.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/fagelemutunuratog.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/r1hgldp1595270pgio5mklet7o/rutagijiguwavewagojujigiw.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960615667de---76037147479.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/92346315803.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ae1493fe2db062bfa86bc4f47c71220d/pulim.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b43126a9660d1c1aba2ad33fd0d2488c/jevudovasujederekitese.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/da744d443048cd81d58bc5b052c7e40f/9462842910.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/119970426.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa13725dd---lezawotofetubap.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092a98bdafd8---42778535854.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 17668 bytes
SHA-256: 478a50937b772420d4351b7c4c7a264b00892caec2e3a1b2998b5136dfa4e4c3
font_01_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_02_sfnt_off0001335a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B71 11428 bytes
SHA-256: 7c32abcbbc8e892404fbe08efc319fc094e3d24b806ee11d448f854f167787f1

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