Malicious PDF — malware analysis report

Static analysis result for SHA-256 9228b254776e5b18…

MALICIOUS

PDF

78.2 KB Created: 2021-06-18 11:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1788152121f4866760a4ea46c82d60a0 SHA-1: 832e7c263863c318ce84af6bbe334f9cf041c1d4 SHA-256: 9228b254776e5b1838af27529c350a602eba08c25a80cd3f1deddc2b4f268068
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=solo+gta+money+glitch PDF link annotation
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4671582af---dekibujujukizimijevumirud.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/69lg8bcs4q0t3507jp2sal677g/42684379041.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/8srn9719ifr7u7cniclor3o2od/50311462587.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620464525.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1420c76f---1718983773.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/15226731847.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/7frpd7mc509rpdf8br8gu4q70v/weveda.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9sv61gc0fa6g83q1dl16jbg4io/matudumabusuxulususepefi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607db3a778d57---13901877714.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/4941644934.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738a85a6442---jisafunaxire.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/429b75e92eb772236eac8beb0bd7de03/62078141445.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b328e2e1e52---55795687041.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/ritikimunegonesi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/fogudopedalewomanul.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780fd6be332---towami.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc0302098---pelen.pdfIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC392 4932 bytes
SHA-256: bc1fd6fc7e9e2d2f23616028acbae6b233b29fd928a343ec1c39dbc11124f4d3
font_01_sfnt_off0000d424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD424 2860 bytes
SHA-256: c865035544b04e3ba0051c5513770b1b4c7ab0f834b2c21ec32b8fb5d658a6a8
font_02_sfnt_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 11328 bytes
SHA-256: c6441f7c0ae89e589b0ab6b14db94d2dbc6b052b9c8855ac3b76d6371f4bbd45
font_03_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16356 bytes
SHA-256: 20aa54a76171967c95a01118eab9c4df723f608536b9256e132745479fd7b3cd
font_04_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f