Malicious PDF — malware analysis report

Static analysis result for SHA-256 340a8303dfd6ed8d…

MALICIOUS

PDF

83.0 KB Created: 2021-08-23 13:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c54f2fab2f47e4c8e25f7c4ad5eb41d SHA-1: f9d95f41fee1d87be4dcb0d1988fc62a7f38131f SHA-256: 340a8303dfd6ed8d00af3dca7e98dfe56ccf8be4c7647af93ae86d5b2c253943
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=winter+humidity+levels PDF link annotation
    • http://www.northern-japan.com/image/upload/File/kezef.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/74094861312.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/65041471704.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/jarigazemutujojozegabosob.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/jexijuwojupixa.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/15663093174.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/42968492324.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/42770538980.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/dcs8emiku3ldcr091lmicuja9u/19357511974.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/18547667724.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/berebunabudoj.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0msgp31eanhpdsjj1vocu7b99f/dijepebitalitasaratizeza.pdfIn PDF document text
    • http://cmtsport.com/pliki/musof.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/wujafituribetenokasoxun.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859d551bb67---96316851403.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/78938344573.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a618cf793ec---11188576520.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/55875887859.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093f5e35e9a6---mobupu.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/dorubunuvi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe165f416---32491805517.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e15954d2d---nuvisakobuge.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/78377674900.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 17520 bytes
SHA-256: 3a51cc7999d46f62f683f9554f19f30a0f568964609cfa00d1ab40148ccdfd02
font_02_sfnt_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 10504 bytes
SHA-256: fbc625e3eb12d89da40da55379e5586edd6591a5228f5e13467360f4f7df141f

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