Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa4243c240da3ae…

MALICIOUS

PDF

93.5 KB Created: 2021-08-02 08:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a2e2a5b64a396c34f76deb8ec87cb05 SHA-1: ead7fbc7579d4b7599948258809807bd004de23f SHA-256: baa4243c240da3aedb7e37e2d49257743ef49a08ecb9b88519897e1d1cb2406f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of external links indicate it is likely used as a lure to deliver a secondary payload or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=crep%C3%BAsculo+amanecer+parte+1+pel%C3%ADcula+completa+en+espa%C3%B1ol+latino+cuevana PDF link annotation
    • https://nazragame.com/calisma2/files/uploads/70462332793.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8deb123ce3---vujetojatipedizo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160912757f1f69---65069367460.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cdbb059af---timaba.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a780b2d9a1d---57727798611.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/37459506871.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af94476564---dakubelezul.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608662119373d---72258192874.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/bofujisodixo.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67774007a---memufovumax.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084064b3ffec---11897732562.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/11545462686.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e3f6154f7e23544e875fbc66203b1005/wapelafivaduxofariniz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058091bdf4---89210806803.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/zadixevukoserufozupa.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160813bb6c4f75---kawalekugijetapelexex.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/32ee2098f35db3d621b45503c2e4f54b/41499451383.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160aa594a0001c---sewekimoliteworek.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a0b752f1d---6266282693.pdfIn PDF document text
    • http://roocenter.ru/upload/file/6767777571.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/815d9e66409b802e75a9095724f9aec6/rolizikipigejutojepakoj.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/xifala.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_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 11168 bytes
SHA-256: 23fce68e9328d049fc25ac8b25494b0dc5240fa91b89af88febb16f4916d6749
font_02_sfnt_off0001374e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 17780 bytes
SHA-256: b33103ebcf2de66da65be1f7964af9e339acfcbf0e6d0791969693c642ac8ec9

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