Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f7f14ca3df969a…

MALICIOUS

PDF

77.0 KB Created: 2021-08-10 02:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dbc402a1c71bf78f1f7845c7a4c291fd SHA-1: 601c8185c7da5b6beaffec2135e5ebff25204939 SHA-256: 79f7f14ca3df969ab96efe45c3c7d81dd36852fd7fb1d4a004aafe0b2f33e77a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest a potential for JavaScript execution or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/d55abfc9dfaaeab1d79142b708368493/fovamagupopisate.pdf In PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607430d0e0d9f---wasasewoniromuranimonenir.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/xiwogato.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/mumagi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/95002842701.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/33ff09259113b416aaded121b92f5c7c/74802672668.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/kuxoli.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608817cf1df80---68198870318.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bdb12281b---97124831238.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qu1p9h0c2eukq4opt4csi12or2/6661638255.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3sdg9mker4950o81fs5q8ji883/jegore.pdfIn PDF document text
    • http://dentistturkey.com/image/files/18485720148.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/nokutidafixusunum.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/74314971891.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/buzuniwegikiwomexu.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/megiwufejakufizusufujitox.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/5615819738.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a70id74prnml5k0293h8hbdrs7/98558364106.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/85961dc8be570a454d57d79e1fdae879/41744181990.pdfIn PDF document text
    • http://learningkey.org/userfiles/41978561802.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/24030800278.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891282483a7---nawipuromovexategi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0965809f3f8f0fc00f6bcee10fdcd62e/86636712890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=decode+and+conquer+free+ebook+downloadPDF 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_off0000c816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC816 17072 bytes
SHA-256: aec54849a45e31113d9d24d7b424f58669f8c7001ce16d7d1804fa8554a2a0f9
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 10676 bytes
SHA-256: fa0ad02c0b3ae75718dfcab81cba9244aa12e856c9a9ac25af8edeaa578757e2

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