Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c65850402d0db3…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 10:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fea8a719012ffcd43854fbc00188c2f9 SHA-1: 454eec1f12de6d42597170281316c1c81d4b1ada SHA-256: 87c65850402d0db387712e2df19157abbea37719973a96d14214f33f114fcd72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristics indicate the document functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to manipulate search engine results or distribute malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 http://www.elmundodelapiscina.com/ckfinder/userfiles/files/setijotebuxozabi.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16156c10e864dd---41802246296.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/dojetinegade.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a86feb57b26925f9eba74c03469b1b58/vifotum.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/lolaruvibemuwisoviwukixu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/ganudota.pdfIn PDF document text
    • http://thuannam.com/image/files/gaganuzosetamozewiduru.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/61532092756.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/kuwejamutudufukugud.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a84047082d989d27b605b417fd3d130f/maforitejesamotu.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/gilumanasidasasu.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/dabigupigulekasuk.pdfIn PDF document text
    • https://samudra99.com/contents/files/22974745824.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/52289677887.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/85112703340.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9e76c8db9---xesanitot.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/5856876297.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/36437409943.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/10384511082.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/jaratowo.pdfIn PDF document text
    • http://pedraferro.com/files/files/61034947897.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/76626304437.pdfIn PDF document text
    • http://czyxchem.com/upload/files/47211363095.pdfIn PDF document text
    • https://tcremich.lu/files/files/69718163917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=rococo+and+neoclassical+artPDF 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_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 15740 bytes
SHA-256: d8774d7a10ba0cb64bc6c73150119aa27f9f85709b451896f6545ce3d9ffe175
font_01_sfnt_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 10408 bytes
SHA-256: 90f26e4c0e71f92449e034f0b42759783b8e1de45bf1e2a1483c729771c7acfd

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