Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e0bb2de913b2db…

MALICIOUS

PDF

88.6 KB Created: 2021-09-06 17:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e25ff1d6770e541766259f6b48bf3e3 SHA-1: 6a22b1639f4a55da08fa3eb3765972140d53981b SHA-256: c5e0bb2de913b2dbcd795f794d8a3c3770a8b47888876340df36dc817dfada91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Additionally, numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f6v79kesdu34j3vb9rg55kcjpo/dozabujokukebavilipix.pdf In PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/65930d95bffd2c1ae91e5e1634513950/mabilifofopaton.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e675207c---68920404637.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/37419321406.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/60922877793.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/jawiw.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/fatorusoduj.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/9vutuec2k7m6u16vcko2vkhm77/jalugepurofuv.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/94503424787.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/54503960460.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/rusofojufazedetozawiwu.pdfIn PDF document text
    • http://ashioke.com/images/library/File/39763926487.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/lolinotosigit.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/dc3209d9ab75d4302f89d9ebc8c84451/zonenabiluk.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216685625609.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62491744524.pdfIn PDF document text
    • https://harom.ro/files/file/jilurubexudasejo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf034074ab---12998122089.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sv40jkflh9q7ksb06mta7tqap4/joxaxeripokoxalaso.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/74b6e01510847fe4123fb54dd73dce6b/refosebiziduz.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/jolewasojovokax.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d8c80415---17332013274.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/ponoreruledagegitifotaja.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/93802066434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ionic+bonding+manipulatives+worksheet+answersPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe70c90fa---10929419613.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_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 11396 bytes
SHA-256: c5855dd4dcd6030ce0ad77973467a8a2fc6192bb712b8bef7b97cb32a38be9b6
font_02_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 18176 bytes
SHA-256: 4c75516663aa783d2d7b51df8ceb126ec41b12fba2ef7d293cb689ac119a0a7b

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