Malicious PDF — malware analysis report

Static analysis result for SHA-256 996b5be0b7e2f256…

MALICIOUS

PDF

96.1 KB Created: 2021-09-03 07:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b90c6302cd268f490abee9f354c897a3 SHA-1: 6232f43a53aded2ce40a38694a69a52311c93eb6 SHA-256: 996b5be0b7e2f25660f1787f93843c5fbc667d5ecc6c3926d0ca09b57af17648
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple links to WordPress upload directories suggests a common distribution method for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d3cd1fc23---87458521611.pdf In PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/59918374859.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/gibonolaxu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3a0d50b4---xewajuzidugazetez.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/rijekubogatowezadoporodus.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/33746091590.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/69757527782.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/latuladunabuwexama.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/222aa4558e7c5fd3e331057478e3f957/pizafonaper.pdfIn PDF document text
    • https://majubesar.net/contents//files/pedejota.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/80328146597.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a039cf1f94---70979980482.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/pigobupolapifeto.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bg0kpldeh9uu8n9rci23ganatc/mepowatiteduf.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/xerasadamonawowu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o3bhk7jo60i1vr0c0ad9oji5pv/terezoselanobupineveseju.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ubo2red4i2gsmtjrdtkgg99ll6/12252107574.pdfIn PDF document text
    • http://jarosi.hu/files/file/zonezefajaberunimamuwa.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/farenoguzakaxo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad62884d6c8---getevimoliwopir.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/55792276298.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/mewopuwib.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/27126323552.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/vuwexuwubek.pdfIn PDF document text
    • https://arerp.kr/data/file///50862286493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=topology+rules+in+gis+pdfPDF 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_off0001187b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187B 16204 bytes
SHA-256: 6ac7eac16f9234c3b48bc8271b144c2bbe14582749c58791ff27abac9d39c32f
font_01_sfnt_off00014279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14279 10592 bytes
SHA-256: caf5f6422857c251b3c266cc93fb3c307d1eb8f26b2a5345ce9611628d771109
font_02_sfnt_off00015a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1