Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a026e9b23b3bda5…

MALICIOUS

PDF

134.7 KB Created: 2021-06-30 03:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78795e93a224a122860c88e621c58d7e SHA-1: c1d4eb1a41af6c88516d483fcc8df81be13ed772 SHA-256: 5a026e9b23b3bda586a08cb28b419c3085742fb9ea92f87d3fbacdccdb456d84
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://koratspring.com/upload/file/godefazogo.pdf In PDF document text
    • http://gelateriacool.it/userfiles/files/raruvonarogetiwikavo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e79fb769a2614cd157430b7d0bafaacf/56692959659.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9787432a9---77425994143.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/20658285250.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd86eb0a5---64263746465.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4555f480941fe1035df28b1f243b659e/84460225612.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2202361f2---69859884361.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7699a78d---3605567073.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f032a5d47---wekajevusebuditalaziwekuv.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/43150846865.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210629_2242B318C2AC46A7.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bb53d3d3---kinofopabek.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/1b6310677a63f0cf2aa11415c7644540/47941206908.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/kakogikowabepake.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uj58o24htn0t4kb1mihvf2ac86/lujemaxuxoguzelovikuwup.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abb5a39daa0---38059805792.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/71388450042.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/jinif.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/1689661038.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/laxixatikosotuwokefilowib.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/xadulisi.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/29878817957.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/nosenoduwebolokixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=new+generic+top+level+domainsPDF 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_off0001a9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9AE 10984 bytes
SHA-256: adfedeceaf6a7962b2f979e9bbb645023ab77af7adbbb66c182cfac4349b1749
font_01_sfnt_off0001c30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB1E 20604 bytes
SHA-256: cccd5a6452bd42bc09db34a984af577743097163875f10455f080e1ba0531cc3