Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa58bef942a967d…

MALICIOUS

PDF

74.9 KB Created: 2021-07-18 18:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 5643b915d6922bf181cef4f5279988c6 SHA-1: 763809ec4f26e5b41693283ac6a9418559ef0012 SHA-256: afa58bef942a967ddbbdf550f1cc7ddffb54da70bd4901ed805cb3fabc946b95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream (PDF_JS) suggests the execution of malicious code within the PDF. The PDF also contains numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, indicating a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 https://electrodomesticaruano.com/images/ckfinder/files/fifolowujinitulodamap.pdf In PDF document text
    • http://komputerzagrosze.pl/userfiles/file/sorukidejiwawudalijela.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/1013050666.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/bibarax.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/91322182192.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/dibevoset.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/47128304514.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/377af8dda7942ff3691b70d9064c7e2e/17731501460.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/6c0d60c1be63dc13c1350722bf842c73/48500634098.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/040800254604.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/14399007015.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/101lumd3tdis0has00fjfirtr7/36456586018.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6abd6f3d0967697b10ff76342c7abff2/75671542138.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/kenipofuzagati.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/rodinu.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/22031881490.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d65292f0f9---zomuji.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/d99b016371294f6434b0e9946ce3dc91/josubowaboniludibuwatuvub.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf727e53ba4---94765533318.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kujidubijovafelowi.pdfIn PDF document text
    • http://primaneighbors.com/userimages/36183457173.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0c36c27fd52cd9a1f966e2324d04910d/75755360095.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/31086050331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=beyond+the+brixPDF 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_off0000c1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A3 10380 bytes
SHA-256: 302d12912e89633de8d632e2c85321bdfbdf71d564727c87a9e76bb15d69e33a
font_01_sfnt_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 17392 bytes
SHA-256: 649c22d4fa2e5636661bcef59469a030d94eafa7036448ccd5a6fbebd69d040a
font_02_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1