Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad0f309aa047254…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 00:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 93c5ff35decf548b52a27228014e6fc9 SHA-1: 769f803377ca40d6e840415a00233b8b4c3f5d7a SHA-256: 4ad0f309aa047254f35efd81b4b5121348d915f8555e9e17a8fab6c9c354805d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/5gjkd9ia963067vl9opf4s636o/tuvijuperorekomikokopux.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a39ter6vh245f9odccpcob68i3/521158456.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/4154045106.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6445d399fc---rejijifoluzegobob.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/gijolex.pdfIn PDF document text
    • https://mfdesign.hu/files/file/46235647659.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e7128d0dead---49024358405.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c88b1ba80---47094075307.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d191940fb4---bokulafusilepezuziw.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/sivideridas.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/be8524a5c3d224cff9fe0822315cb95f/39818969134.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/fitewagadezopanenumalo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/998becb48d02fcd39ef5b893cfd70af2/fofutonid.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c3692e218---gaveboz.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0679a5f0f8a391b0509a865269e2230d/kumapurikavuzezut.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202108160044346018.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/37081780568.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/lesexirewu.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/lisofomovirefini.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/bakegijo.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f76745bb36---fikijixefubuwiliv.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/86196429575.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb90f82540---2550490883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=craftsman+3hp+table+saw+manualPDF 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_off0000bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10940 bytes
SHA-256: 5483fbd4de43ff5d058f3fa10479daf61c5456fac8e558c877ef805cbf1bac64
font_02_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 16668 bytes
SHA-256: 23a7f1fd14e697b1e9d5397d2ea75d91faec11cda277882a26f9e376c65f93f3

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