Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4eeb54018a2e42…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 13:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cd522c912c942b9dd09cf7afb43ea78 SHA-1: 99928683f06504d5c8b4662b9b7889a21f7a1ffb SHA-256: aa4eeb54018a2e42e5d8afbd2776f9086994b4ff4e446f84e31c172486f76b82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicates that some links point to potentially malicious files hosted on compromised CMS upload directories.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dycelife.com/userfiles/file/dovaveweboxedategaxe.pdf In PDF document text
    • http://canadanur.com/resimler/files/mopajinumezarebaze.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/lenabipaworaw.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/61280207669.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/gabafow.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/ziwen.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/98786274132.pdfIn PDF document text
    • https://successalpha.team/upload/files/58852809093.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/52445469631.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/gonosoziwaxedudorefibenul.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acec02ca29---velasopajebalexiwozukeri.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/nurepuzatamimifafuxuwise.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210906164813.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613825ff78f07---37109491974.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xewoniwowutirikeletar.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320ea7b71a3---10327699199.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27715122145.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9bcf6ea8cdd1589f5bf625c1f2e3a973/jepofoxelebodapomakerilad.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/99719300826.pdfIn PDF document text
    • http://www.polni.si/Images/files/49085102278.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/99882338359.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/54752606730.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/nodobob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wifi+speed+slow+on+androidPDF 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_off0000bc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC94 10472 bytes
SHA-256: 59a9ebddf5950662381efb2b4f12f6adb089956e121e571326cd62046d70509d
font_01_sfnt_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 16252 bytes
SHA-256: 84afb3b0f5b33b7a0f70449779aa21600996dba98adb628eae1292d4cc3e9517