Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db06d34d81bd2dc…

MALICIOUS

PDF

80.5 KB Created: 2021-06-13 05:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c6cbd26268127a9430f3b4632988461a SHA-1: 5137d0094ce04ffd8ad298a5612c16ecc95a33a8 SHA-256: 0db06d34d81bd2dc65b48299cb4e516ce450e60a848c47f4833a40666166dfdf
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=preity+zinta+dil+hai+tumhaara PDF link annotation
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a39348d1---delavikozasugu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944bdae3367---80248563428.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/5qmtgnp4a8bdq74mv0r20dij68/74751676643.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c442cd7e32e---pinaxutikexamezuraju.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/a11df0oko9oq2qs1skas4e756o/72145154984.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7335a9cee---16053570496.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/94e50f1240f5b65a13688584c44b4d50/mobigixugejulawulit.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ba1339e07---sabonisaz.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f2190ca24eae68906025e2b167fee612/gavujiwuwibomupapilivefe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0445ab2855---4276536573.pdfIn PDF document text
    • http://novichiha.ru/pic/file/tirov.pdfIn PDF document text
    • https://baongochoa.com/upload/file/81085578472.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pp1qhepjd04jpipcj9tj4ocn37/40126873157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61E 5040 bytes
SHA-256: 08e50f2ce7445dea6a57e1190c11b3225552127247b4632c41a6b845668e6f90
font_01_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 12768 bytes
SHA-256: 51e1956ffc68fb272b878559b05e1df988b2b3577dbad106358649c8caeabf3c
font_02_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 16624 bytes
SHA-256: 6bc37ee1c4f37aafd708b73eed918706bc29bbecc7482a36c01d63abe42b1767
font_03_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 3292 bytes
SHA-256: 91303141e995c31f39c5c8dc638f340883031402f40009dad24a7d667525ea11