Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd09cec73f8535a0…

MALICIOUS

PDF

99.3 KB Created: 2021-09-03 23:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b163a2c476e011c04046fd5a763da792 SHA-1: 759873be8964c442bc5c3fa4e56d902e2de6d0cc SHA-256: dd09cec73f8535a090bc9457b6267404cec92682f68c09a0d35860f3bef97b7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user clicks.

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 https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad9e0f0bf---30570129674.pdf In PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/vanovepuwe.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117ea07f3217---13373238896.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/manobelajimuboror.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d71a7f4d3---64739289134.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/147037a1f705227de0291b7d8b19c239/90142460136.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/bulibelejuk.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/pijodonubibazatagifez.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/1586354487.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/rajojaganolonilikowebado.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085347a3d5e2---maneg.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76d0494be---tunafogilemunarelubomemu.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/14546135745.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/kamuzemagiwefet.pdfIn PDF document text
    • http://esistore.com/userfiles/file/rapusibozotefagefelexow.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af820c4b7da---75469047623.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/63825266307.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/19722976016.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2gdde9ekmn01e1aa0bmchid9ui/gadunewiparunopamamamo.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/822dd39881ad23e4ce508311a5f7afc6/7226676848.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/sorafogijasoruwizaju.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/54ukvdpbur2om0ks3kac9557c6/paril.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/satutofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ielts+writing+task+2+descriptors+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_off00011dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFF 11044 bytes
SHA-256: 1620101769539f1e1a821d91a2f2280573ae48f6e8f411d64cc1be4e76b94d05
font_01_sfnt_off000137bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BB 18488 bytes
SHA-256: dfc9b13aa7081da52d0740eb20c84d797ea8522ec4524d287548f327387950f4
font_02_sfnt_off0001672b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1672B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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