Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec7f777ed991e00…

MALICIOUS

PDF

77.6 KB Created: 2021-06-08 21:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1f810c80db65a95866c8ca1dc19a7b65 SHA-1: 6c10f7baea200b5fdc52ff0df74179bbb1a35351 SHA-256: 9ec7f777ed991e00db8b1e1eda68e463b3b631d8f614a99ace6b9b332e03a752
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed for phishing or malware distribution. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns indicate it's designed to redirect users to malicious content.

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://crysiq.ru/uplcv?utm_term=neon+guts+mp3+download PDF link annotation
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd171955c85---zogudeviribab.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/1737779366.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/de9c6f51d7735b91815e16997a9e2295/nafunisewujikil.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/videxijo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caed1053eb---26701993913.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/50037493166.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7130a3ef5---95115530522.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5bcbc990db069f9e5cf25b948a14026c/jotusosozasedut.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/65774861314.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/1a96c06d38672f9a56ee627604477270/mijatagazadilafozine.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aaec96a868c---3433384815.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/sujetalisivorejaz.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/warosoluzataxenuxonikufa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bef234d5df9---wibakajijipusulusukis.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f5f07849---lozeju.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/02cf45cf6e6dbcff6ef6155b36a87a48/sisibujiforodeteda.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824576021cd---tapazafazi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab838f27e30---diriperepiboxeduzonita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 3676 bytes
SHA-256: bf2729b3bd7fd3fa0091bcedf37e3a7e19b65665300dc6b0d2108ca7d4012ef2
font_01_sfnt_off0000e66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66C 5408 bytes
SHA-256: 724ef380a5465beb1d2afe3270f1bb169f32152cec2d8c38fad601306c98463f
font_02_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 2140 bytes
SHA-256: a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
font_03_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 11196 bytes
SHA-256: 869e4b0d2fff544a3dbafb3da7dfe6041a806a9a8d5d271d31d01447df2aa407

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