Malicious PDF — malware analysis report

Static analysis result for SHA-256 be06167f5a550bc7…

MALICIOUS

PDF

163.2 KB Created: 2021-09-08 11:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3112d30823766ea7f25c429f0ce996e2 SHA-1: ad3fd561c92f40e197e27915d309e230197eb51a SHA-256: be06167f5a550bc7a5f0a476a40a7e2ab679745b85a1707dbdbb622d0f4bbedd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to phishing or malware sites. The presence of external URIs and link farm heuristics strongly suggests a social engineering attack vector, such as spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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=industrialization+worksheet+answers PDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c25d7e254fd---xenav.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/53277777347.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0t8ucf2rjdh3j54heijkav8v23/zuvodorezikomiwoluzupatu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/7cb9df3193e227814b03e502c976536c/muxexovodatezixurinovade.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/5459353295.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/144329b089ebd0b0854e955a76b4f43d/fejexurokitiforot.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/dofuzexe.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/q81bb00il5p82delv192m52882/15861252634.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/xemepugiwojugodakofa.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/l01vr73d0hps9qrptl853akuh0/59847486315.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/369ead5b574816033ede21ac74e53363/90795370612.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/vilivijamajufusu.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/memuxojezajifiwatizanani.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb4fc13f6---tavawibubojek.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/labenasasevijelivizi.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/8842572443.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/54659457673.pdfIn PDF document text
    • http://flexicourse.cz/res/file/mimezeradugufegebezilok.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/mevefe.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c365254d3dd---22753565166.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/lonavabujudikike.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/705faa50c3810605fb864f08aaf550ff/50995521205.pdfIn PDF document text
    • http://erdbau-rauch.at/xoxapogatupasef.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/wezakutewakumawe.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_off00021bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BF4 19196 bytes
SHA-256: 355adff2111e3dcfcdf385c9cdaffb555767623fcb3e1c3cfccda043c99b3ec2
font_01_sfnt_off00024deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26602 10636 bytes
SHA-256: 7eca0fc4b524085b3c2509f99bec8b1f15b4d23f47b5c661706a12ea36b78d92

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