Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9ccbc0083abdf4…

MALICIOUS

PDF

145.9 KB Created: 2021-06-20 15:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0dbab3a7de03867e3987e9591076b0d5 SHA-1: 345ed3e6f87e31d80e296acb28a39168e52ffc97 SHA-256: 0a9ccbc0083abdf41fe2a7367a6ec5eeebaa59c437e6878846ecc3736afd1862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm hosted on multiple compromised websites, directing users to download further malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7c6f6bb9d---67504457076.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b83977f46---tagoriku.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53afbf99f---zujarotujirogejomuxujazin.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607425f17ebf4---11102257490.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/3ea2a071697e19d734cf059bd246c5e7/74792740091.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc988c7c4ac---tabagajolajiwajawitewibu.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/taxisejusejov.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/3c4aa47ce728b21c48856e1affa802fb/5930518138.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c73b37fa9952e5501b539d719253197d/mepojurefogelujabivuxas.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/hqpukrq695oklu7qp0gcfclqbj/dozaji.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/2f9c008a274ea1225ad3d24309e2f87b/popoxepikodifepiwibuj.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac6230fe70---19579641211.pdfIn PDF document text
    • https://flyags.com/editorResources/file/%5C/dugafudupaboxoriwasarik.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607661fd35f85---pulukukututen.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/30047e54c54e4fd98f69df4a12cce9cd/22713418426.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/62a9fb7930107716e5cf942897fdd142/nuboson.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nirvana+in+fire+2+reviewPDF 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://scripts.sil.org/OFLIn 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_off0001bc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC77 13540 bytes
SHA-256: eb5226975d730bde77b18e73b1271355a4788f976b799fde83b4362de7f942fa
font_01_sfnt_off0001e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7FE 4804 bytes
SHA-256: 27a5486348de8d24215a46276fb14a398e0a287d7e4c30b70e83cf1238d3d6e2
font_02_sfnt_off0001f881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F881 11900 bytes
SHA-256: 23fb527570452b35c9576db87db0b2b552e36b6ef8cfa4fc2e4dc7575d4df359
font_03_sfnt_off000220a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220A2 17228 bytes
SHA-256: 700fbc245a5bf9e658cf5e605d52e491010c971a58bf6ceb6e427d2040fba36a

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