Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d824fd40040706…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 11:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ec11735d9cf58db6a2f95ebfa7870b8 SHA-1: b1ae5d28978fff11e4c484014a3f8e92abdb8597 SHA-256: 11d824fd40040706f9a10921d6e0e72c950b78c33f837e69dc990e2be386d05c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to distribute phishing or malware through seemingly legitimate but compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=watch+harry+potter+3+123movies PDF link annotation
    • https://augsburger-dartliga.de/uploads/file/16359852336.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/73872260730.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/8633slcam24gcdch9gplkug5s7/jikuriju.pdfIn PDF document text
    • https://songhongresort.com/img/files/poxovema.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/093dbb68aebe772aa862755c31cf106e/taxekewig.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/88707336272.pdfIn PDF document text
    • http://dhf-china.com/d/files/ralokatuvarewap.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379f473e7d4---1335614038.pdfIn PDF document text
    • http://innotack.com/userfiles/file/93484865694.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/95724889545.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/kosolumobekotevof.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/mefanabutevegewenofixoxu.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/tiliziwinogetasogifu.pdfIn PDF document text
    • https://aashianarealty.com/file/forubimega.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325a671e819---12685953438.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/jubexileluvuwapugukixapa.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/72553755378.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/somumogaminogojoseriw.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/55414139097.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/xavijiretoxisi.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/45678642533.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf18f2175---26764097843.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/tapegupejerepiwetudetoner.pdfIn PDF document text
    • http://hingliltd.com/userfiles/49833065005.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/36826868155.pdfIn PDF document text
    • http://talesma.com/E/file/xilik.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/47934172910f377be1a509fec03ad9a3/modikafaluwadepejeva.pdfIn PDF document text
    • 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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 11004 bytes
SHA-256: 30c23438a8c16893e4a16e37d420d6d09efe8d4e359e7c8567eeadb4a6f09fbd
font_01_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 18984 bytes
SHA-256: a60eb533a3ed907d1e65061d451349d6fb0f7a29397e7d9eaff0da7eae1b2020
font_02_sfnt_off0001260a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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