Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cc3085bc110d72…

MALICIOUS

PDF

79.6 KB Created: 2021-08-27 20:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 300b8320ecb5a7de8408d26b07356fdc SHA-1: e76d444dcdc4b936b2d5f85db5eb74af6c801526 SHA-256: d1cc3085bc110d72f7d92af3927bb497e4027231d0d8480d4b961949e07b63a2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=how+to+factor+a+cubic+binomial PDF link annotation
    • http://starwindows.ie/ckfinder/userfiles/files/48133764021.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee1fd15c9---vasawajamasejenizop.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/60170624025.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/ruwesatepimew.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1c77740e---13457599781.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/52379928315.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/pomapanewa.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/49631063349.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/92302324352.pdfIn PDF document text
    • http://jump360.co/upload/files/20210704083125.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/44854865264.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08a065db8---48980852971.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/jomujigijebodebodasum.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7ecf664664ad07d7143a2628d0f7d43a/xekobunifise.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b6bcccb36---bolufejipofuwudapajegub.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/dotaxanonarimavuzipara.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2ce2c9cf---nudurisulawav.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/nerop.pdfIn PDF document text
    • http://hasyo.net/files/file/93974849585.pdfIn PDF document text
    • http://slsnn.ru/content/file/80860346930.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/nogigiwudaxutijewuroderu.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/pomebame.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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 17684 bytes
SHA-256: 69f74fc96bda72709371bd7fda297c06c4f2318ba29b0108cd819ec3f4d393b0
font_02_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 10516 bytes
SHA-256: bcfc4917d8b4e392ce680581770ab9a14a5a1744015296d5b3018e682d4e853e

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