Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6e28635eed81a0…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 17:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67986031e6200d3aa7b061b877a02b9e SHA-1: d1a60c07845a2bda04a5a002adee10a5d38340b5 SHA-256: ec6e28635eed81a06a79049f929fabf9850bf99b0e6db7981e1275dfb57cc9d3
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery information. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or credential harvesting attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://serviceelectric.ca/userfiles/file/64747839422.pdf In PDF document text
    • http://innospectrum.eu/hirlevel/file/93896284647.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334b868f1a9---30740346215.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/88518635524.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/fejokitibegofenopaf.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/kotodozuzigatexe.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/87709535718.pdfIn PDF document text
    • http://chromavials.com/d/files/sifelamusagutux.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/65767597139.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614308ad6e12f---xogusupuzotewuferarokaziz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c63809e298b72cf49f7140bfd77d6183/55976090045.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vemegatafujagedazus.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tupisivuroserotuvi.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/79c371d914761b2d5d48a50892c3f12e/tupijisokadisi.pdfIn PDF document text
    • https://orrizon.ru/images/file/kogajuwuselagatixugidese.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/45184700826.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/tifazevetiwumapanajexa.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7e9a0a26---26952484499.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/molilujokized.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/2610351307.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/62459255486.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7cd1796e---52931844114.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/71567132023.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/54130812652.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/10917066167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=linux+echo+envPDF 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_off0000c1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 9980 bytes
SHA-256: 95cc32a0c29de26012d6b8629e26b8a4c6f06379795564cb57d41ee4071cfea9
font_02_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 16988 bytes
SHA-256: 844ae1003d22d107e4140cd73265954a7d33c2097c41e982b3069eff9664e289

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