Malicious PDF — malware analysis report

Static analysis result for SHA-256 2100f81a88e6037d…

MALICIOUS

PDF

97.3 KB Created: 2021-08-11 18:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cb75986bd6a0943719df843b28e74396 SHA-1: 2249a7411c0047786af1346e423691ab1030b473 SHA-256: 2100f81a88e6037daaca7db3f42884256ede4394fb9c681ed1bae2842d80d2cc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://allytemp.ru/uplcv?utm_term=tcs+fresco+play+python+hands+on+answers PDF link annotation
    • https://menu2uplus.com/images/file/fejojubutesakurakixowo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/seas88bjul944fp8l237lhe61p/18508407742.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8460618d3c302688a087dc54f333b77c/ninazumipopox.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/kusovanadewotuviweful.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/82a3b5b71c6f2c2a56cae1936f9f3860/4121461315.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/99787983073.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a9b35921dd0aae3319d0887764904efb/10440608378.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f50947505---73441941350.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff31df5f2---worosedebikekagotuxitiwap.pdfIn PDF document text
    • http://nfc.soo.jp/file/64023594946.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/67679017284.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/mewaf.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/vofod.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/zatedefal.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba03e05159---tijoxe.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d85a7091---53370371456.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839e03db254---99759728080.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cs0fjs047fc3dmc3q6fbdu0lgq/jadixami.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d997f043---tufevokopi.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/26316265053.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/zixexulapusiwu.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_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 20972 bytes
SHA-256: e2a6bb2923849cbf37be4bb39bac92502e9f11fedea420332bfd0dc464a566b8
font_01_sfnt_off00014529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14529 10788 bytes
SHA-256: b784a2ed37f2e51266195cd4fc9de5f40e1e0b1b35f28a5807d44ac6d49e1480
font_02_sfnt_off00015e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.