Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c495eb8f10d2d97…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 13:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf21a43673341a4bc6fd492bfc10ae74 SHA-1: e510a236ce2e0684570719cca2ed2f694f7bd73c SHA-256: 8c495eb8f10d2d977134a8212d0ffd6c79c7ce28a4e62a1c37fb9bb4f887f5a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to phishing sites. The heuristic firings indicate a link farm pointing to compromised CMS upload storage, suggesting the document is designed to host or link to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e011a54b226bd1e22608f52627518978/lepoxiloju.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/nvf4t20abu4ctt167k5odm80ic/32088794470.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2baea7d1e6---soxajawuwuvakub.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/pesegivediwowixaxiwo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607798ad9d8ba---tubumi.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3c125ec5---sogigosabefuwepabus.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/sorerutix.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/dezikagese.pdfIn PDF document text
    • https://digireg.pl/upload/13868759307.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/fafupovavapujupo.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/59762719320.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/11897438642.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/pufapuresuwetonadabepojos.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3cs3moetf3r34prln8gvtmmk14/38558324604.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bcff8ac29b04b2eedd4a410f1d782d27/45264116305.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/33906296849.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/71660052500.pdfIn PDF document text
    • https://mauspro.net/upload/files/94569619936.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/29476184829.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3e51ts40sfqi1hvkjqst7gdkjp/16133112272.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/92686417760.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1bcbada949e95f6dac2fa565409dc763/97218369605.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1024860157---1302635153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=shikshak+bharti+syllabus+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A1 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_01_sfnt_off0000ceff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 19912 bytes
SHA-256: f057c8a32b1692f88116d902c6dfd46f8e761b5d9d206fda99486274c82b91dd
font_03_sfnt_off00011982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 10760 bytes
SHA-256: ad0b966696975af1c67ab02dc0cb673044049a28f993cb93dcffa382764b81b7

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