Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c4d20d3c4fc6b0…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 21:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08c42471b7f2aabd2942ad780cf6522e SHA-1: be972c8c48b06a285f33deb6504e1fdef890f02e SHA-256: d2c4d20d3c4fc6b0aab7369ff007fa2c8f51d144734bc4e62971cdf0ba1c3a7b
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing a truncated URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://infrive.ru/uplcv?utm_term=harry+potter+6+sinhala+dubbed+full+movie PDF link annotation
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1729c21802187714f35468a29be162e7/jiwupoxelonixuto.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/pirebuturiw.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/fifazigujisekavo.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/zegux.pdfIn PDF document text
    • http://kd-council.com/upfile/files/63506471266.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/20479957943.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/561af2ad7b3c8ddddf0760f4161c53d3/22189390269.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/janokasa.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b592f9f67bdddc1466b5de1cfc59aaca/gefojimolitiketunu.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/11764087371.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/runodosimutotafomedideg.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/jabuwilojipibamaborimi.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/bijamaxuz.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/jedisujomam.pdfIn PDF document text
    • http://sivam.pl/files/file/tobevunuwuvude.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/nukukazuwozidukovimor.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/eq7b3rqv5p65cbep3dnrksf7mj/weboxosex.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/8151468307.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/41470168561.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/70746186610.pdfIn PDF document text
    • http://bulmarconsult.com/files/xopugusagi.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/wivomojarisarorokebes.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_off0000c5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 18328 bytes
SHA-256: f9189011b282f0a690c3c001fd5099038abbdf9cc5d47cc4bb3a5b5f78d13b7b
font_01_sfnt_off0000f53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 11344 bytes
SHA-256: aa2b865668afd9409665864865ff1a69e4c5747afa4de1ecad0d1d60ca3752a4