Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4e8d94a25d110e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 18:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc72b61f77daf2e4a715bcf0a9c78d48 SHA-1: 154f7bfda7a2c43f86f2259c1082433fc5368540 SHA-256: 5b4e8d94a25d110e848b8ca1755272a6f9eca76f635b2331e7f8a8936ced6b69
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically a payment redirection scam. It contains numerous links to external sites, some hosted on compromised CMS platforms, designed to lead the user to download malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://www.cafeinca.com/img/public/contenido/file/13815382637.pdf In PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/33680874209.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/49903506056.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d369da8de4---81024624881.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/rupejebotixaxetigijon.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/85491729535.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c158299a---47291113046.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/80998546867.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/7d66cec418c6600f517eb2360fcdec73/70099714137.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1f204567---jotij.pdfIn PDF document text
    • https://ekransamara.ru/files/misivujibanalib.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/82597073942.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/75704504880.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/timamivuzilikinoxolujivu.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/topagisated.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/9942468880.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae032931f---mofinade.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/eba64ab973d690601421d706dba116d4/nasujugitowutozurexavosa.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89438009256.pdfIn PDF document text
    • http://coffee33.ru/archive/file/sixarudevomasevudis.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4b077f5ea38d358f2d5a1721320ffd90/wizonikopanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=orientation+manual+for+new+employeesPDF 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_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 10844 bytes
SHA-256: 0b0755653b980e34e0704665ce6c7d225d3fba15b9cca826c41f2f8993d8d1c2
font_02_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 15840 bytes
SHA-256: 775247c8fdbd1538d0e4a4a6cebe1578c3b29e0c9fae762492fd3f2ea6ed278a

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