Malicious PDF — malware analysis report

Static analysis result for SHA-256 5663b4650d8fdf58…

MALICIOUS

PDF

112.2 KB Created: 2021-06-13 09:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fab1486fca1397786335499a77157ecb SHA-1: d1a49ddc68fb7fec992f86d938cffb56a5b99094 SHA-256: 5663b4650d8fdf5808a03db18973ff4b18334d7e11a58a1330ad3e99512046a8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The embedded URLs like 'https://allytemp.ru/uplcv?utm_term=grammar+work+for+class+1' are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=grammar+work+for+class+1 PDF link annotation
    • http://andlupa.com/userfiles/file/79517407016.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/clguf9tlquuilstp13keoecim1/likebanosu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ede59304e6---bizulaxixefagif.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/7577d94fce45e06290932fe5f1b6a3f2/fukiberevok.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/dizaropuket.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/a187eeba4178f1fa927b7161b145d61e/jajet.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gemafa.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc094e53ca---26638075708.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/80817946224.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00dd363fd---26894417111.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb7c5d8d6---91272764793.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/60698644761.pdfIn PDF document text
    • http://dgjst.com/upfile/file/sosudififugusivuj.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/jexixa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/6r90rck9vns4ugpndipqt24ut3/16490446293.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AB9 5268 bytes
SHA-256: 3067ac7d89f0f7bed5dc9ce2d23d1a3a16da8cd5f48e4a6fbcc0bdb47e3283d1
font_01_sfnt_off00018cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CAC 11384 bytes
SHA-256: 63f063588c1a8c48f0a07b216c9dfda1d71e76c3be0e2ad0e914a02667b5ffe3

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