Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52400afadc6f2a8…

MALICIOUS

PDF

108.3 KB Created: 2021-09-05 07:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b62061b5d8b5679bf76ff0aa95a7f31d SHA-1: e15f64031d84f9e885dfa8e223a30ede9f0424b7 SHA-256: f52400afadc6f2a89aa57ba7fe42fb24751d0b00fc6cbbed9b618b3cf2f78d68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the malicious activity, possibly by initiating downloads or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bsa.by/ckfinder/userfiles/files/30802896612.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfd38d345---lomovowizujefidalido.pdfIn PDF document text
    • http://cwesp.biz/upload/file/zekixijeverow.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/t9tmjk73nk9ii63door4e88bv5/12523204776.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920504491b5---57439740932.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/43319829548.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d9331c6cf360eccdbc279871b181e86c/ratalijedobisinerulafi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/4httof4tn33rdmn2chuc9ftc07/98939413849.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca6caaae64---74601355424.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/49896011970.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/921318d233e86ddb81c869539eb63600/21618254484.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wabijaferekukutozopugodav.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/mugoputopilakawovunivigo.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/lofenabudamanurited.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/69064185268.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/23224549146.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1236eebb---58602090617.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/48748436297.pdfIn PDF document text
    • http://goldenapp.net/file/pulumeliwodotilitoxal.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2809bef075---43971937064.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/65539018055.pdfIn PDF document text
    • https://somogyplusz.hu/files/bunamosunixevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=beowulf+poem+english+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/aec8aeedd7e3d72c1c44217e9f4ede52/6314711499.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_off0001403d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403D 10824 bytes
SHA-256: 8c5599ec8e5c45f4bf427b69822fd3e49dd700d7531f37f0f93593124a6441d8
font_01_sfnt_off000158d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E8 19744 bytes
SHA-256: d09d5551c5d417233d16fed40cd121a03cda25add0deaa8a999b2465c2e371c7

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