Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3fdc094b1d33a1…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 01:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6d7e61a193dd0056a8e6e310cf58efeb SHA-1: f37f8bf45ea3ae89bae52bc26f86d02994a81d0a SHA-256: 4d3fdc094b1d33a115d7580ce225934242ebd41c8fd27fc60f07eaf46d111be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of external URI indicators and the compromised CMS upload link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=the+incident+in+ghostland PDF link annotation
    • http://singer-island-condos.com/userfiles/files/dopuxakifedamimolanubid.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/kekazamajulolovutiz.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/78716877223.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd1a4d918a---91979042425.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/96203daa8aef1592f655442a2a73ec47/totopokowupir.pdfIn PDF document text
    • http://fygl.net/uploads/file/240141063994.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec22eb31a---26251237394.pdfIn PDF document text
    • https://everestart.com/images/stories/file/bobonitapise.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16094810102b20---23333972428.pdfIn PDF document text
    • http://candientuvibra.com/images/file/luxatubar.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4c524be531af4ac4ca9bb6cbbca03640/73383905234.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788a202d601---25583071077.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080acde0100b---duginodakonuwojerupum.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095b27df0637---miwalalagipodevi.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/cmf56r3dapaq4dis0ti48plob1/53330146312.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/likirugenenelilezajuk.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/83145c46407d8a6447e548530c4eb525/95440344967.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/sobexelopawunil.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/nakovopurumiwowamorinek.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/b6eac5ac3562f1c74b29b5a809faa2b8/89814525920.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/m8gqm4l24mrtiak81je95il93n/virajojupebuxotilipelak.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b859c19b485---4545392890.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xizofujenodipidened.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e0adc22e2f81c7a36737273d47d8af3d/vomapaxeki.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_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10512 bytes
SHA-256: 966679cfab6e36bce65b1e2171763c7a4db4d078a932ed4e64ba0e34c17b8c00
font_01_sfnt_off0001042a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042A 16836 bytes
SHA-256: 63d60c3066873089a75830277182b0c74645daed6fc9a58030394cc5ae5d7b93
font_02_sfnt_off0001303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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