Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cbc790cc346060…

MALICIOUS

PDF

85.3 KB Created: 2021-08-02 21:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e3c8c5f0752d0028e7710a0d2dfc0df SHA-1: 91942d16ebccecabb30f3af2186c8c5d7997a0dc SHA-256: 55cbc790cc3460601d0f7a5962703fe46b5e83c333dbfd48acd025a655c3d90a
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a callback phishing or tech-support scam pattern, prompting the user to call a number in a billing or security context. The presence of numerous links to compromised WordPress upload storage and disposable hosting suggests a link farm designed to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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.
  • 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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b304c8e9---81117012764.pdf In PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f5363949983f0f1cbf6ec3c061500c3e/52423497926.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd592cd796---pexuxugukem.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1622976606.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210622_aec6d.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104e470417e1---27481509081.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/dizipusibapenoz.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4a0ad206e134bdc17b7eed9910014e30/25128157691.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610068816a611---76004224779.pdfIn PDF document text
    • http://malifer.hu/upload/file/penoxufopifexaxunumaridan.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/60661421572.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/40c80b2f9ca6f4b0cf171881c78a9756/24513773810.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9afbcc52a4982b052936e19976c46e9b/kojubolopotuwezivu.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/savamozalagawix.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c120c50e8e619fc84ea773f35df494f8/63770619554.pdfIn PDF document text
    • https://strechybenesov.cz/content/vopowagiladado.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f1e5ab6d---tagafevidenarozapadukog.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8816d575af---6999610817.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff3ea2543---63943457189.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/genitobesatabo.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/jegolopulos.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/28qo45e11pnl9b5vlq2klsls84/69387173199.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5483ffdf94afdc305fca17955bfdb829/sigejedelezubalipojit.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/55962920935.pdfIn PDF document text
    • http://championsview.net/userimages/dimefevizowedoxokizid.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/n1gqbnnon9935269natq7tks34/bunedixitiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+update+bios+msi+b450+tomahawk+maxPDF 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_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 11252 bytes
SHA-256: 718335d982a76f79c846e21b3cd65c8522487f5bbe7f33878c1c3beb7a3bd278
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 21352 bytes
SHA-256: 1798f1f75162ff59e7de6f305fa8c84e483b1a2b644f317874e8130b1739ea05
font_02_sfnt_off00012efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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