Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75a567fbb0a9f87…

MALICIOUS

PDF

67.9 KB Created: 2021-10-01 03:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 836cac19b6515653bf3d1ac939fe9dfa SHA-1: 403e4ffe4e94f326a494285ac55818ec70caff30 SHA-256: a75a567fbb0a9f8796e02d40dded19ffdb5279c2ddd01d25c6000c46844473af
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 disposable hosting or compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://e-district.org/userfiles/file/pukosejuxusewatewul.pdf In PDF document text
    • https://ivanda-commerce.hr/userfiles/file/timabapajavilodamepajabi.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/dakuduvexoruwud.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/pelivubowopolami.pdfIn PDF document text
    • http://mcutech.net/files/82006051142.pdfIn PDF document text
    • http://simonide.org/userfiles/file/33922021152.pdfIn PDF document text
    • http://centromp.it/userfiles/files/67159128354.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/59996642674.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/jatinabajojaguzezo.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/24156578581.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/tamevexokute.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/dofekanufokurujaragabivos.pdfIn PDF document text
    • http://reylab.com/userfiles/file/bedujivomawaraxetudutis.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/76b34993ede1eac7d4fbbc2164db2dfd/40424867450.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/raresobidasom.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/wuxugilipefem.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0ee07d1444a4ab3b80e59652d63261c4/85452617030.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614819fe965ff---7012076484.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/lozokilafap.pdfIn PDF document text
    • http://czminghe.com/upload/files/lalawegetugituxisopud.pdfIn PDF document text
    • http://onlineauadms.com/ci/userfiles/files/kipekusedifugunuludoga.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/84079906423.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/kopowesir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tab+key+on+android+phonePDF 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_off0000aef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF1 10484 bytes
SHA-256: e35178620c4043dcd8f80e403684f98fca317e0e109bfc452a94fcd67b5d8cf1
font_01_sfnt_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 14424 bytes
SHA-256: 2284bb53bf36f41deee43588233a3c4372cf66b21d51fb9c7c71cb4ec820b39c