Malicious PDF — malware analysis report

Static analysis result for SHA-256 f171d273ae1bda4b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 10:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e970d150ca00452c85a93e3923779501 SHA-1: 8c05845e2997fcf32a2452067e248727efd97e06 SHA-256: f171d273ae1bda4b3c0429e880a09e070466b1a4ce0128fb11c5d6a79f51bfe7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate the PDF acts as a link farm, directing users to compromised websites and disposable hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://harckocsik.hu/userfiles/file/8857457666.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b2f0ed010---mifogawanevavavom.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/861136820.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160721437e0aa5---fidugatewo.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/tenulezibaxikolarip.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210822073431.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/62831378360.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/64550636302.pdfIn PDF document text
    • http://yuhongzg.com/d/files/zifuxikuraxizibevavibipe.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k8qrukurtd2sm8bt9kndlvi5t4/mobawajumiwadufupurutopop.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/6772626631.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddee77c5fb4---gulejomak.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd4f2dc00f---9706414405.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/57144793478.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/40987810919.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/vutozaxeresisipus.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sjl159jurga5bc0rkil5mkrc6f/93210059104.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/tewededekifoxogudide.pdfIn PDF document text
    • https://kildevangen.dk/files/36814674096.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/sizozurumubuzixajuvem.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/tigugaxegototugitafomob.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/4002110873.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/zenupivu.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1595450217609d581761907.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec10fa4b2a---lutubowulexagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=wipro+technical+interview+questions+and+answers+for+freshers+pdfPDF 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_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 11108 bytes
SHA-256: 8589309fc0c25764a7e3a8371055b4eb2a34b19a728d6ec84162e182313c5bd5
font_02_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 17452 bytes
SHA-256: a52ed1632e32e9c141f413642ff72ad22c5b671aed317e14f5e6a381cf6d4a89