Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c460492dbbd6588…

MALICIOUS

PDF

84.0 KB Created: 2021-08-07 06:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 146ed4748d8676d8a8bfc2c46892760f SHA-1: e2173a609333e917e35901d67130e83862f37a86 SHA-256: 8c460492dbbd65884d5c6151e12ed8c777416f37279937fe9029bb6c315cbd25
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute code, likely to facilitate the redirection to these malicious links. The heuristic 'SE_CALLBACK_LURE' also indicates a potential phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kaupa.cz/userfiles/file/43437541223.pdf In PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/47784327482.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3703dbde19d29c0bdeea3472bc80f97b/feseva.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/27625277767.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vk8f8hsnjqc14prfr4ct8s2amv/pufunutuxuzupezajojukenak.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library//File/puvoriwetezefemonajuj.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa621ee492---17954616595.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/xolovulatel.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0fd07d1aa---96553409505.pdfIn PDF document text
    • http://sam-global.info/files/file/nuwujatodomukoxit.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf413a73bb---79555683207.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///xadarezutelufafepazowakim.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/662f57kahdf1u4b9d3gk5r8l8p/30938617903.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54fb90cb6---kokasugafe.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/57388358120.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/gunalig.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/61596814189.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6b33e3c7---saziletepififejulugoviv.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/84278566788.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/93153988240.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379247194b---babijofebigaputisoputa.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/64e9abc46f85a7c22f2a4a574849ad24/birazaxiler.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3959a6eb33---77203260258.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc5a6c2fad7---bolukonezukixidiwiziguxuj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a0c7ec07---5743411576.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b0275e412744f91be20f3dcb2bb37f37/18686661191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+an+old+roblox+account+back+without+email+or+phone+numberPDF 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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 17156 bytes
SHA-256: 8a90a5e6827bad7b67c06af65416005675c90803f70eafb1c75d6bbabd6fbb04
font_02_sfnt_off0001277f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277F 11304 bytes
SHA-256: 5a58b596459eac6c7f142e77a182b5e5d47b1f07cf68d40cc104d92e79ea0826

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