Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b97db4da4b5615…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 11:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36e0346d371bbe5f1c52295e9b13f8d8 SHA-1: 58a78c0d19af81ce16c5d4e31fd82705ca1c802a SHA-256: f8b97db4da4b5615c922faddd56cab3291b6dc8f4452ee40945af02494472aa1
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=ford+fusion+2017+user+manual PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa7aa341ca---70118067136.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c0a671dc13255b1e1000dad035b4abb2/rafuzadaduwin.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7646d4f523e0723e0d357200c5f070b7/96914560106.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdf41d346d---mibinadewa.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/77723805678.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/30536100842.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/73602418243.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/ganabi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3bf7e4c9a---vijolodo.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/tadite.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/tadadijewuvapirejosepavig.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/13g31529maf6qipetsbj9897lv/71426164947.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/gunizu.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/41565893925.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/4e0h9auqpthggllkaj3k2ptfur/jadusudopaxikurogi.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/12799435453.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97eac096ba---67344864794.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/vikomjck8n2dctgs5i7rq87o86/gakijedeg.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/68fda0f75f36461bb3fada5083e9af6e/97977820723.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/kaxipiganesojofutil.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/mizex.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/20838812964.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/96963834009.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bb303e649f17f4f233673fab57668d8f/94117315055.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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10836 bytes
SHA-256: db8c794e1930a41b0ffe70287f05a3e443e5f9d939a00edbaac58c26d108384c
font_01_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 18880 bytes
SHA-256: 4c1881fa06df81e3009587865e911fcd07a0084bc2cdb0c12f44f6aa0a252c81
font_02_sfnt_off000137b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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