Malicious PDF — malware analysis report

Static analysis result for SHA-256 2807ccb6f33ca80c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 12:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 1e9286eb636d17da1d7bf65b2730d579 SHA-1: 40bdef1aa4ac74bb871403dd8d13c652999e685f SHA-256: 2807ccb6f33ca80c2be57af2d3b566a30f3f6900947d770cb82657306571a843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential phishing or malware distribution scheme. The presence of external URI links and link farm characteristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=carby+repairs+near+me PDF link annotation
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/rurosowifutesi.pdfIn PDF document text
    • http://accronline.com/userfiles/file/3018886175.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/llt5aagnb4ulcpof0tsdu0jcua/25298426490.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/99440708367.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac804457cc9---dezinepejabezilaxajuxi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/153535e8d9ed5a785d264eef0fe6069c/84495507575.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca952d6fa0---4043970197.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/larep.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9804a6f44---50685694954.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ff1d4005421cd81c0d30bba58026c5bd/gexunijawonuwojofizexixaj.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210716132426_139450550.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dfb72e580---tozegisomifafosite.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca503cc42---gutedojovuf.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608399ab488eb---82992102520.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/debafafotanowegixapax.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/jimovifetugezusu.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/wutumadozetarofu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/jufetifureromaze.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ra4r0l2itu5ll74dcs6rdohmc2/romulis.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210716100655.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/delobuwamimijuluvujegi.pdfIn PDF document text
    • https://esvigo.com/upload/files/dogosotipowunifopir.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/19403072292.pdfIn 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://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_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 16712 bytes
SHA-256: 3b705b64a4c30923438dc665e4b1276ff4a8100e63608bee668489b48e840b29
font_02_sfnt_off0001247b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 10432 bytes
SHA-256: 3b9eb5b96623cedc5c4c9c377fdd4f0692f72a99b4ed73d4c237abf995e01288