Malicious PDF — malware analysis report

Static analysis result for SHA-256 139b26b65699d27f…

MALICIOUS

PDF

92.3 KB Created: 2021-07-29 22:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dc742e3e5aa0e6838bf2c185032a351d SHA-1: ea04187903a5646960141240d4a283d28e8dd09b SHA-256: 139b26b65699d27f40c47a88b3c9b2a2720f56dba65ddf3ae4e51b3b67f43172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the nature of the link farm and the compromised CMS uploads suggest it is designed to lure users to malicious content, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/042e008a5bd40ba68492e57f4e6a78ec/50550170925.pdf In PDF document text
    • http://dailitara.lt/bites/uploads/file/dewizotarozelasadenapaz.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/12c12b42b1c7cb291269d0b6bee22bf6/34617592495.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdeb6b8e697---61812371127.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/a47obh2u9oqnrm35d6ktobvmee/63365515923.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/sgrpb7bmrdi41gs85ib004eamc/23602443872.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/kawikug.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3350cc421---69621107301.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_045000.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/67400113769.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/xupuvanipufukuvox.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/waxawutowipenezuvudaruve.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/tazawamo.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e345b400c2fe7d82915fa411dcb0b336/xunuzigi.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/a45aac8c2cabdb9fd9df1ad9421f9e8c/59194872548.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9eb314cabc3f6e55d567d632c630bb85/folisamutidulukani.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9620210ce8f6a312904438ef30ad171e/50066104016.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/30032680515.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/70169596393.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/rofafikuditezurar.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0065453c6---63863394784.pdfIn PDF document text
    • http://yuha.be/_files/file/korinateworenase.pdfIn PDF document text
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/22091165810.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5eb413abae963e80c9365e8c3cf6035b/kexov.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hsqrps37ueo0n06jjs7g1f139m/36750800081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ejercicios+de+sinonimos+y+antonimos+preuniversitarioPDF 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_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 18292 bytes
SHA-256: 8db0b66814d6a9f661cadc797953bd5f462fcd52e37e7e521f8aef6c3c4108a1
font_02_sfnt_off000146e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E9 11020 bytes
SHA-256: 5052c64f02a4ef73d0550c4dae88e3912a89e53bb9845ccbcea7bfcd4689daf7

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