Malicious PDF — malware analysis report

Static analysis result for SHA-256 027e6adafd62b3bc…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 06:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c28c3a7f4f6cee5c830149630edaae14 SHA-1: d3d49dad24ae4df9bab2f53ec45119524359aff7 SHA-256: 027e6adafd62b3bc7ca3028767a0f02a6d926c1f5dc120a48a8e43b3e28f8223
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a sophisticated redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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=the+three+musketeers+mha PDF link annotation
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c888c93784dd7815545d7aa2eaddf052/jorob.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/rexilidivijagujig.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/47069007124.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/suraverepuvodinese.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/1v90gt5s350a6h9t0pjeifbulk/miwusozeni.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/marojonufefatedufozo.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/sitipukivitamuvezabuna.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/mumowowupoduvosijojutexu.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/219cf29951a53e4244f565dbf32e1938/27845121206.pdfIn PDF document text
    • http://heureka-cz.eu/files/96000054854.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/10222068620.pdfIn PDF document text
    • https://profesa.net/userFilesfile/banejipuxutapobowatoduti.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/90867220367.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/xosogikosi.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/zituwemob.pdfIn PDF document text
    • http://nincity.de/inline/file/piwipa.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/vukef.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/84938244711.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/81819397670.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d69441a014---38140138363.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/s4mm1q7nhlu4bp2osvd38015s3/51761437810.pdfIn PDF document text
    • https://energooptima.hu/upload/File/disolirunovig.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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 10168 bytes
SHA-256: 6b5ae0cc2cb7ce9ead49e8478d26f1b81d4890ca5f6a7085dfa9bf4ac1f66eba
font_01_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 20812 bytes
SHA-256: d6904ac42843dcea923ab69219f3c6379339c68c4f0f7b1188faf15fe0a786c3
font_02_sfnt_off000128e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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