Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1c3ba2b77675bb…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 18:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25bdd6a765888a20526b49730d07eb06 SHA-1: 525a7c3dfbdde77a6e4ca2088fb1c26516867743 SHA-256: 3f1c3ba2b77675bb05b6fe256a8bdbb52f5478d6b984b7ccf3f1194623e907d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate it functions as a link farm and a credential phishing lure, impersonating Facebook to trick users into clicking a link for 'free Robux'. While no scripts were extracted, the embedded URLs and link farm structure suggest an attempt to redirect users to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=roblox+free+robux+code+generator.
  • 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 https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/4d5587312919e91c20c6a49152fc4356/bapulotawurosidino.pdf In PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/napun.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gkm3i4cagdcpvr6pnpktc51dpt/91401839411.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcea555a0fac9a872ce3e352bc3750f0/15534729208.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c9f39bb05b3ae61853c2161d85b7ca0f/93602548452.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/piwotezufadezetobulapoze.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/dabixilivolakewe.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f35a430a0ad987aa973d993a545127bc/2529739455.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/47949736962.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3dfcf13e1---19864328416.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/4255113917.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/0525eaecbf3f23de612377e033f7e39a/39154291476.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c831b68a1e0f98e77dfaeb30f1dd84de/74032737097.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/33328166101.pdfIn PDF document text
    • https://bloomeng.com/uploads/11876394638.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/47016020561.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa837c0c4---88327963233.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/aff6e32062081a5108c2c1e6b013b8b5/37339798213.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e05f9a770---92983042080.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/xevuzanegepigu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/jokatogimemeniwulofuxan.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785e0e97473---guzaduvinixilibuva.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8bac7d8bd10aab140930ee4b4d664b6/17189726982.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/damumopowemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=roblox+free+robux+code+generatorPDF 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_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 10776 bytes
SHA-256: ca40c646b3f3ca21c7376fa0037b22a9b960f5ad07185fd95f9efbb2ce12c17a
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 17612 bytes
SHA-256: 3a148bd287158c459e7a1713712b1ece235922c4d213288eaddde36a3d561894

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