Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09f99a80bc9e9de…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 05:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ba82c5962512f76d54e8e8da1342c8a SHA-1: 60de841ac60f6a5277cb40db2210a5e2ee4f78a5 SHA-256: d09f99a80bc9e9deac49fef565cc6e832f4a504d565539b564a1472830a38703
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://catamma.ru/uplcv?utm_term=examples+of+graphic+word+processing+programs PDF link annotation
    • http://www.serge-valentin.net/ckfinder/userfiles/files/gixozotofas.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/11332477847.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/31695652167.pdfIn PDF document text
    • http://charivne.info/images/file/18781131331.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/89432984490.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/xamidugisuvenuzo.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210913_299396888BBFB4A1.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109042234013582.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310417d00b7---31308235478.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379289e4a0e---tuzikejisigojekalemudex.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/26643725951.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/susepuvefedo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24c8c7614770f8680696f15b1ba76bdf/pesidawixisajitejosavid.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/bemakebalamafojunujog.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/79335059004.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/namitovalidaradozokatur.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613552d02532b---58820033621.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/jamajawilafek.pdfIn PDF document text
    • http://marymo.ru/uploads/files/6258699372.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/93123591187.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914032448.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/webamasitepuvaxe.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/wofanumuviwilivavupefi.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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 18020 bytes
SHA-256: ec7fa37e33d34754ee1793e46ac45b8a0b67ebdbac2cc2bc6fc97ecbedfd540e
font_02_sfnt_off000129b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 11140 bytes
SHA-256: da51ef635bb1d082c381486a3c84e775550f0bade6b1ed596606f42a376ef80c

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