Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d99b381dcdae28c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 19:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f002a34c9834037fbfe614e449183b3e SHA-1: f5b34551a5caa81d5bde035862169e3b7ff61d86 SHA-256: 5d99b381dcdae28cdf80af9face479adffb0c96d2efe1e2b2ee4f080a4fbeedb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=pictures+of+cartoon+characters+to+draw PDF link annotation
    • http://ideviceplus.be/app/webroot/files/userfiles/files/89673123796.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/nagovux.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6cba84b1---vinavalojozofi.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/zoxupefulaxa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k890pjsjnrmt55ug23ef04v4u6/90835645095.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/229683227848c7014b39822fbcd3dd79/3215288886.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/11460269499.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beefe364b21---21414106936.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/guxunofiruwagapamobubakog.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/zopuwobozolum.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/40885039896.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cf8115d5cc38302b736d9fce7f5a3b2d/fotewe.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/vudavawebemomolakivapon.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/86482790776.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0ab5f77f---31213937423.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nklr5d2gm0u81drkdn194v5mvn/difubiziw.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19bfb4612---31450389602.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/gotudikidosas.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/jobivajususaje.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/depadorez.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caae3904761---gufiwapi.pdfIn PDF document text
    • http://effektfilm.de/files/file/guwevorabifagugitomipilo.pdfIn PDF document text
    • https://advik.net/userfiles/file/sodelirivijuxutaw.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4d9eb7bf22627ec80de4741229322a74/mavamixemixekakisofup.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d29aaac3bc0---23580073478.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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 10712 bytes
SHA-256: ef67501f9881787dbea2d84b05e68526f494c338bd215eeb1584dcfc46736def
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 17224 bytes
SHA-256: ff7fcd3ce7a818e1aa321f10e86e9c2f0744b8d2c66f4895b2fe4843c1f3f5c4
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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