Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d1b69ee2183783…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 09:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ccb690b6cd14825e389badc3257193f7 SHA-1: 4fdd23390a4a779c2aa09072d43a63a8801dab59 SHA-256: d6d1b69ee2183783273777b9c25ea394b0cbd36227a7893200ab33d86427fa78
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or providing sensitive information. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=among+us+online+download PDF link annotation
    • https://sapsda.com/SapmaUserfiles/file/97770692514.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210929_E351381DE54B365E.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/jiroxaruwe.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/saxalalutilugawawet.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2fb37824e---zanozetofepalusevifo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140480b55dd4---15208012918.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/55894338550.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376143422df---nubesulupetipagulus.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd99041850---murefupigetese.pdfIn PDF document text
    • http://someteme.com/archivos/_20210923145357.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/86825529725.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16151a7cc2cae5---lafikawowupomiwesut.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/dokubizifajura.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70297798591.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/jokejopunumirad.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/64259014491.pdfIn PDF document text
    • http://hairandoil.com/uploads/pilujuruwusunixugabeget.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/buwimoropitop.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/relorufugatiwi.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/xatokutamipederos.pdfIn PDF document text
    • http://greenegiving.aboutgiving.net/sites/default/files/editor/file/61178949880.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/73028348968.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/61849949989.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/pawekukuzeneneruruweja.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/lapixusalulojanifogor.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210919061822.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/75430737678.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_off0000b671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB671 10560 bytes
SHA-256: e4e4421837c4ac98cf351931aa31d891bb1cf735e61dd39c6df0a4da34b9eb6c
font_01_sfnt_off0000ce5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 15848 bytes
SHA-256: cc9ae22d5b3defe83abb3e194484e931e15aea4bbf3a41bfa1d9f4cd909b8a87
font_02_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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