Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4504d6f4eafc29b…

MALICIOUS

PDF

80.4 KB Created: 2021-06-10 10:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 847c9aaf3abbbe29446ff3b2474e83dc SHA-1: 5c89c71e54dfddf47d77d8b3bd8d494551c60b9d SHA-256: f4504d6f4eafc29b467bc121a65cf247cdbe68cd7ea36b08b49cd9eba73036e8
136 Risk Score

Malware Insights

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

The PDF document contains multiple links to external websites, many of which appear to be hosted on compromised CMS platforms. The document body, though heavily obfuscated, suggests a lure to download an APK file disguised as a file explorer. This indicates an attempt to trick the user into downloading and potentially executing a malicious application, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=download+ex+file+explorer+apk PDF link annotation
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ad51712aa6ac81d983c07db90b16e231/68699455349.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9a78ac9e8---wugusuku.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fjbc81hreg8q076fl5let5ece8/31871048929.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a50524318c0---nakufiti.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fipunotedo.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/e171fvqpo3em15p6oac8g290b0/jumejigozuzifezuvu.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9fce337af47ec18f22861c8cefb592ab/zamezikuwefuvexedovi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907162e197b---64830162790.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/dfe0900754566b9f348ebade2774425f/nekomerunesagemibu.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d776b759ded21b4afc5619c2921262c9/47454936795.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/debolukowobuxapijawokuxa.pdfIn PDF document text
    • https://patc.fr/imagesfile/13597387031.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a355f467ae---72483523501.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fa65b7e14fce3c5f374cea8952782bdd/dojemerumedenanodajumid.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d54d34b67e1b1244e333af28c84ddb0e/butapagemalazupujen.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/41309378742.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ni71bp49d3tg9eehkdmegonjn9/refutoxomid.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9efd03ef90afd0eec141077b1fc889b9/sugaxudopez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 3148 bytes
SHA-256: f3b76193e0a07d045bf49e573a7b20327a2e4077b5eaa8c8b0f96a93ba2e5d95
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 5080 bytes
SHA-256: b2893861fd215d5358eb9885a70a6bfe30cbf35c780abf25b930ce0cb9e38db9
font_02_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 16452 bytes
SHA-256: 725741a3567b470fdc6313eae4f37c9c54b1a6980d790c33168b7638b2217a37

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