Malicious PDF — malware analysis report

Static analysis result for SHA-256 8860b5f82cd6e866…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 03:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 233f290bd1ae85d14ecf1734fb8afe59 SHA-1: ea763f789780da73222b2f0ef5fa2a7a82d45444 SHA-256: 8860b5f82cd6e86608d3fb1517dbd36631230af259db4522f16aa5e9a2f7d0f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further payloads or phish users. The document body is unreadable, but the overall structure and URL analysis strongly suggest a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://aihr-iadh.org/uploads/FCK_files/file/8234556400.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d72ccd227---26313388648.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/55018729682.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b108bf4a1dfea10c4c5f7fe32e9005a1/80596993983.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/22328242178.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/jomabezobutolulav.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/53384172093.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160784dcb2fb7f---86330686592.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/691cb1f4b9f38c3dd9a99627ea487b9e/dezawunajudasexeme.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a500f9e7bba---15566266779.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210608_DBC57FDA3314BBF0.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/19373a2815af436fb7e354fe890f41a8/jowezo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/980a0cjqk64fajrppsfekc7vtm/topiwalixomomobafe.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/xupova.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/e2d6283dfbc57ac0fa7b4a4a886e5980/93061341021.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/tiwulu.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/rabobixuvegukenida.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae338a97e---jegodunimiwojamup.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/kesarifosoxojubalorololev.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ole0nhcp3kh1s5f1v2m0q3vs5i/89664110850.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/778f26c06705d8d451311ebce533d184/mitor.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hlqm0ccd6gsa05lncscgo8l1t4/xofirumobebemajasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+christmas+truce+questions+and+answersPDF 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://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_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10884 bytes
SHA-256: 9cb0a7719bff7d9511438867c72e0c03461294e2ae2d34a50992f8c4c27a91a4
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 17484 bytes
SHA-256: 7aa5cbe03ba63e9562ef83481880de244a82bbb09a92d0c029910d3f7a1a9e0d
font_02_sfnt_off00013501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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