Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd67e626e70186a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 18:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3655dadb542ddb18226f83406944d514 SHA-1: 1017868446fc2bf3763242f32cb711a882f8edf1 SHA-256: 7dd67e626e70186a4f2c2b2e860288ec8226372d103a4c30234da7b08cfe400a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious content. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://durgabas.coop.np/ckfinder/userfiles/files/mobuzupow.pdf In PDF document text
    • http://stonebreaker.at/xusovurevinu.pdfIn PDF document text
    • https://0900107678.com/upload/file/18772285811.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/danimutebeligar.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f8980a26---10510812318.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/dafuxuzada.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/55727518561.pdfIn PDF document text
    • https://nada70.org/userfiles/file/31893749858.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/juzinusujodinadubekoma.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27554606913.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/pezepenabobemofi.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f08d235d---50597061492.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/35820839296.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/tuzadaveturoberarad.pdfIn PDF document text
    • https://trystsalonri.com/images/file/jifofulixovevewasibupoxuw.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/xufirekuzuwavirevupuzono.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/sipururosodukiwaji.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sonupisexanigo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e43e0438e2496b65795b251bc6edb5a1/jonaxasek.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///4836668127.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/bimeledawas.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/dovonavofawevekokesegobu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133331fef691---81560738976.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffa59e659---23453885325.pdfIn PDF document text
    • http://kleiberit.ru/files/file/88661647913.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139da8a6308c---pimufinenap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=buttermouth+best+streaming+sitesPDF 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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 10804 bytes
SHA-256: f953b8c3df30aa2ad68e0587cfb139db38a44dfc56e6bf4d3d2a67fccb1a8c44
font_01_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 18232 bytes
SHA-256: ab00ec747b42ba7fe34016494bb6399f42e7a2cebe336557bfe34cf42cca4eb0
font_02_sfnt_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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