Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa676873e668116e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 02:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc7081da620e3f23e13454497f4eaf87 SHA-1: 3b3df637dad5717382e4089df8d1b2b9ac132298 SHA-256: fa676873e668116e23f663ebdd9695d5493cafb20dfe774d6eaa4d92a14cbc10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9997

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://archism.ru/uplcv?utm_term=marion+county+wanted+list PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127004a2bcc6---46442895922.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021071801534813.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f985077a0---75249171029.pdfIn PDF document text
    • https://hoalavender.net/upload/files/ruvisogitalilovowi.pdfIn PDF document text
    • https://eventaipei.com/upload/files/jiripanezused.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/38820548291.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edecc895f4---vozozuwenadosa.pdfIn PDF document text
    • http://webursitet.org/Files/file/26410783450.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/97806058140.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/89651306679.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/manujani.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/taxuxewolutogeme.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/xitotuxisexekeke.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/9nu2hb85ljphqtq3vl9g7gn3s7/32968124346.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/41061270652.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16120dce5b0e6a---xubobe.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623311066.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/kisafetibeguga.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pb90ioal9hr5rv9rppmj2fgfp9/211793007.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/tuxelasetesomuz.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/902688400.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_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 16568 bytes
SHA-256: 989c9e304a8d8ad4135de2be4ec3838f3c643046901f2b7ffc27c57a26a3de51
font_01_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 10656 bytes
SHA-256: 642e8328c9d4671d8691e4a63fbfb10a46a3dd8ef656f61cc57e41f3c10667bc
font_02_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1