Malicious PDF — malware analysis report

Static analysis result for SHA-256 c715cb6b02c2ef57…

MALICIOUS

PDF

91.4 KB Created: 2021-09-16 12:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b5677f402821358f991ed481f1b1b4f SHA-1: 5819dca1d1b937a178e9c0f4a0ae4814b5366d0c SHA-256: c715cb6b02c2ef5738f33f54464ade62b8f0f189b72f1f11552afcd5d914dbd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://catamma.ru/uplcv?utm_term=android+developer+podcast PDF link annotation
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/942bqn7as7akkf8de608s97qo1/zurugaxexil.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/zojepimoworunojewixifojos.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/lokosizozov.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/1517003236.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/tufinajixazajilegukumeb.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/lonariperakozusizomokabu.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/kusedetenomemadamavarixo.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/nasevifinovewopug.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/mexovivexup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c1fc4d51---juvokarireku.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/91385312040.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/gibugususutitomizemol.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mumekaxorovebugumokodi.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc5e6da68---miruxi.pdfIn PDF document text
    • https://hse.tw/upload/file/nudarozatej.pdfIn PDF document text
    • http://szcftz.com/upload/korekagiv.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/xovuzurobu.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/tuxunatapasotamesiz.pdfIn PDF document text
    • http://asqcert.net/files/files/vugaripagizusajujoperazij.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/73604126469.pdfIn PDF document text
    • http://domplus.su/userfiles/files/53859165516.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/24397007946.pdfIn PDF document text
    • https://o-dance.com/upload/files/28343331676.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b28893e3---kotalupoweguwo.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210902045741_ir21ck.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_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 17908 bytes
SHA-256: d761b905529f32b8fc1ce2437d8c3bc51dde0bffe1b8d126e1a85f8197653ac1
font_01_sfnt_off00012fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC8 10556 bytes
SHA-256: 99b52448941fcbfdc90404c3158f7934e027fbcc6af906c5609b66e2b4511b02
font_02_sfnt_off000147fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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