Malicious PDF — malware analysis report

Static analysis result for SHA-256 906ae243e9ea1fc5…

MALICIOUS

PDF

82.0 KB Created: 2021-07-24 13:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fcd7f6383bfc6cfde917f81114dff8b SHA-1: f5fd0af92dc89d213097cc6a4c39324fbd4d4ce5 SHA-256: 906ae243e9ea1fc5f073d5cfacfe63d214e43a8b582492658c64cc172c738b25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3ad24482dbe0b1a1d431c6218c8b8ba3/43475646090.pdf In PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/5d8823d00df97f28530f8b66e73dc57b/zawufuwovezujuruvafi.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/nudolorunanabigupi.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/21324739255.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/32944911971.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/23d2p4de50l5s84bbggir38i5h/nobavuxinoponak.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb8c81f13---jefobupuruko.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850da151304---putizujukewejaluxose.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/54235603231.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c40fec304ff---guxitevigoteruvepajow.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/95701097278.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7e260979---69428619616.pdfIn PDF document text
    • http://schokozentrale.de/idata/xabudisezubudofaxo.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077782657ef9---20172967920.pdfIn PDF document text
    • http://amandamaitland.com/images/file/pileja.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/tfp00opvhrecdcoug20c53lp73/sixudetilokeremojikujop.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/kowuribope.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/00uo5r55bokc1a9j6demrboltf/nuvivajimulalunabe.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/mixerun.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/39874358478.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd9546fff1---28741796585.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f9j5s4571dscmgisfvjr5o43s6/lifaruvadijogakubutuva.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/rolukef.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f0d29a4e62c876592726320e07eb806b/57834107412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mercedes+w203+workshop+manual+free+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/61677285658.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_off0000dc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2D 11380 bytes
SHA-256: 3068eb1bbb50d4eb130b0bac3078ca58994a10869c2ae8bd49b3839568edf9c3
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 17156 bytes
SHA-256: 2eebd4a5a7675c2b5985f7d484e3df97ea7264eed9fcff3494c3537d7b7ba15c