Malicious PDF — malware analysis report

Static analysis result for SHA-256 348288257c0d623e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 21:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0cf43899e841b2c13c9187d137fec8e0 SHA-1: 532d0f23dfb2bd18979384dbf4b0d96ec34f954c SHA-256: 348288257c0d623e55195d94de9e6b3f59e582ae29979e0494df4ff18bd4745d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.morrisjones.co.uk/EditorImages/file/18536211633.pdf In PDF document text
    • http://hanahana.vn/media/ftp/file/xonunadadenepumuwezex.pdfIn PDF document text
    • http://e-menu.hu/editor_up/piwuxojusolitanir.pdfIn PDF document text
    • http://cataga.de/beta/files/file/dotamifoxukiwinamuj.pdfIn PDF document text
    • https://venus-forever.com/image/files/17982790886.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8674fea34a8bc6550e29471557ff35b8/23199597383.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccd045977---7515602237.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6b838089da9f2113bedc2ffd933a9f51/zisokupitusi.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/39561495173.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/jekaluvajogatunalefugewir.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d43dbaa1b---37375782373.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/pijevolexogatafe.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/matibipa.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/16054590502.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/95643533109.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/32566262953.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/korofupixowatemuret.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-21/20210921011445232408.pdfIn PDF document text
    • http://fkhd.cz/data/img/kifapotozopot.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3485dc1b9---taxorigenibelus.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nekowowareneveg.pdfIn PDF document text
    • http://isvpro.com/custom/files/kowilesodizafanuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=words+with+p+and+j+in+themPDF 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_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 10820 bytes
SHA-256: 73c71859c817527f15e04a4c6893f4f03b66474ef1ab6aa43fba123bf7d2ad43
font_02_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 17188 bytes
SHA-256: 35463297ee07fb68fef0a4cfc4687ce842456b0dd0b6322792a1a31e09768af5