Malicious PDF — malware analysis report

Static analysis result for SHA-256 be36cd594f901223…

MALICIOUS

PDF

80.3 KB Created: 2021-06-09 12:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7774797db3cd876d53fc6da2501d74f6 SHA-1: 735c963a4be47ac1e3cc78ea2e182242a7b7ecfd SHA-256: be36cd594f901223f3557106913b00c26992eef8d0ad96628c279daef316cb8f
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to compromised WordPress installations, suggesting a link farm designed to redirect users to malicious sites. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and link farm heuristics points towards a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL analysis are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=unblock+cookie+clicker PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4198543e0db519114342e95f27ec72d4/58149829857.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86ecdc674---xotalulagevose.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/30026f2cbe8e5ef297d68368f0ae4635/selanukefa.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0b17c75dd29ac4068c2148de74ac3c40/41233289390.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/zopewemep.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/36814604572.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/302244303813.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9a8f2b8f3---vilonuwixu.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc42745b60---26136608808.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54240c595---xirina.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a3lbkaju1ieshv706cf4kdaja4/rexaw.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/327587cd87551739699d3d1fb377e83e/pimelozesu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2acm6bil2ldnq701d1ldd534dq/nobupovevajavezaru.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/622aae0de7b728fcc3aa9c40fd84860e/rilogekavukujisuvi.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/8213973048.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/lejil.pdfIn PDF document text
    • https://github.com/builtinnya/UncannyCIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 4308 bytes
SHA-256: 559fd82f53c0142ba80db44ef577c29665f721c9f73b751c8ab6dd260e1706b1
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 11324 bytes
SHA-256: 3109c503336bbf52e5c6325f5e57024fbeef19265622ba5755ea65efdf4f508f
font_02_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 16448 bytes
SHA-256: c2e39e7cff6bdcd24d75cfb25ab97f9ffc26fb7b96103768481ae7bfffe6d209
font_03_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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