Malicious PDF — malware analysis report

Static analysis result for SHA-256 123af9aa4ef13282…

MALICIOUS

PDF

82.2 KB Created: 2021-08-23 12:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6d657913ad13ffb3c151c4d086dfe55 SHA-1: eb31305a2ae81ded35aa9442cc9fd7316346179d SHA-256: 123af9aa4ef1328248c4a73f0ecec790e2236d48334f6baa7ff6b01a2263db3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be directing users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=cruise+industry+pdf PDF link annotation
    • https://nada70.org/userfiles/file/10704312025.pdfIn PDF document text
    • http://ubest.ru/images/file/19782800925.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/pasatuzozumawazapub.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fn5cgeirqtpqmjpd48mqrlvdh7/zokitodudekogamapam.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/89205724919.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/71373422563.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/56220009502.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608670226457e---74059414947.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/67851789118.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210626_D2625A47DDD5FA1D.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077177a26962---76277005946.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210615_388187AD53A3ED00.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/3211801749.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/nemupu.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/10297884345.pdfIn PDF document text
    • https://drsaman.com/files/samolisebavodufenegonela.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f632c1923---75406904680.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb1686bd42---58532443736.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607532300cc68---muluvifojapelolasuwawenox.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/fazubozumirub.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/70207878636.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1224997b890caee0a3a13a4136785c15/92177774938.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/36278127257.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc26298fdb---59398367520.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5160b8ad3ab01a1d8b8024af9575176d/lapabetufusowilewaxudalor.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/46030242492.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_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 17028 bytes
SHA-256: 1f79014daadff67bedb640306551483dd440401486f68a01cea75117c3c4aca2
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 10408 bytes
SHA-256: 8032d580d8ca384139a40ff4a16b7f2cccc60191e67da7eb84948b072ec6070d
font_02_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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