Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be6142cba43ed3e…

MALICIOUS

PDF

87.2 KB Created: 2021-06-19 07:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 598418affc67b48f2fb67949d058c937 SHA-1: 2610bcbd15b8f17536d88ef0e9f3781a4c74c522 SHA-256: 9be6142cba43ed3e8b5f69d468cec84bd4dd7b8b53571fd92eaaef70fb6ef37e
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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/66e1bf79dddab50a1039f4c1956222f4/35105809660.pdf In PDF document text
    • https://artlabjo.com/userfiles/file/wozexiga.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3003ec981---regibotemukunado.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0b58bf11849452a3233b2069680d2571/desodiligemumi.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/ked3i7klh3m4ch6dsan92vssgo/biwabufesunobovi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/84080916329.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/sitl0l0kv8htes14aenfkd51l7/nozivubemufuvasusima.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70a7e6a27---33011463875.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61a9ce6bc---ratifef.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/48854125033.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7159da9b1fb9f5c652e9161e5491ffa5/60696059351.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21181a1857---6213515910.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1mpcp4hb7j2du2j2c39lh7hift/10271908682.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/45300004472.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qtucuhisk2nq1284si53k59ll4/29226422787.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/96573370f6d25a048371926cac0600e0/punamutugujiwekatikavi.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/49679887104.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/74194339642.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=happy+birthday+areeba+imagesPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 3808 bytes
SHA-256: 271ceb3d470348ce584901e76ad37c4d7e90fc23f821395d5bfb300bf5efc7d3
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 5544 bytes
SHA-256: 9bbdd8f1a525b677d499d84560e04c2453a7cbe0f43c5f7dfb31b1338537ec2d
font_02_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 11432 bytes
SHA-256: 21dddc7f4c8aa82831fef39b5a12cf309c5f8bb2b48fa7bce5221c5bf30847fd
font_03_sfnt_off00013590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13590 16892 bytes
SHA-256: 3a16b84ff81fbe54b9a84439faabc31509d75c4cb7b9163432bead352dffe762

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