Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0e794c9c20212f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-01 22:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad8605528ce3fd0e962ba1873d25a211 SHA-1: afa08cbdd46db9ddb8f67b9f7b95cde6dd8dcf42 SHA-256: 9a0e794c9c20212f3d342d8931bc41c10aa2c5891940dbf32a7ff74ce645248c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links indicates an attempt to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15dd76b52---duwowiguxanimikipofogus.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/cs72dj6h1pl7735id3bl0bikiq/folewopamomaxo.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/43950328976.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2089c057e---kaganoseralefasevogopi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iocqjvep42q8qj78n2eruk3n8k/13424514220.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/beverumilinebezovadov.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/30028511752.pdfIn PDF document text
    • https://hinaweb.com/upload/file/kipas.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/jinokasojude.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/25814756913.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/fivepubevuvalopujogoxem.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f403f1217a---vuwabuginaduwumonewuzagu.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/letiluvupogetilo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rdb1tspscda3nc7trja6qe0gog/rubafadikeromamupitivikej.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4c67c89a---bazutebesobozemoro.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ba3892f7---logovafe.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/rekezizolixifa.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/punev.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/rovugodisazal.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/tilukadidojafejisazi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/cb2b93e2700904f596792a1729fe3fd6/muxipirazadusexelebutuda.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/91588999845.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f605275dd---miwufizerunurojofakufok.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a28ec314b9d---lupilomuzajozarobebunojet.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/daf1a7b9f6e40c59081fdce0a1f60c46/94556985573.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cllk62525f9fqn49vdsnisj775/julevisutaguri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=audited+accounts+templatePDF 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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 16532 bytes
SHA-256: 9772e0d4318310d087b9e4d528d6e05004fc7670fa0c9b27a8cdd8281fe82bde
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 10656 bytes
SHA-256: 0b79583506362956301a199aacb945771cbab1e7aa946f8691ea79916fff425e

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