Malicious PDF — malware analysis report

Static analysis result for SHA-256 726058d35e71b34d…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 18:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 99bc676331513dcb9ea79cabf4e08ee4 SHA-1: 73e46fe55c09d216ad109c02a4310fed166daf9b SHA-256: 726058d35e71b34dabeecdc6f5120f25e09f4c9269991d90e6662b5f4feee6e9
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://scuderia512.com/js/upload/files/pelirudaboxaju.pdf In PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/98695916411.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/binolibe.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/pivafefonokogorubujiwewij.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/fuzeduvopomumekubulukile.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/bejasukolirufu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/137935274ee4f4115c4cb2a49bc9af5a/24445521039.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/37313564833.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b08837bf20---jolegatetexepanutisezeta.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fupekolomabukivukezosu.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/pizujofuzilogumarig.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/60380716153.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/918d3b0609088e03cffcb4804937b4a3/85103386816.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/nusonukazobejosuzijuk.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97036416599.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ds2s31nptfsfqgunubd5siog9b/tanojuvow.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/dd9834d4ba123cb73e67ac78a58e0921/lawoweji.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/kizebir.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d29e2941e5e---54928902016.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/1070289023.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b17a3974540---11126646239.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/25055065541.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/99d9ddb3dc4947fcd6f3612857f0f4c4/wibimesofaku.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51672946743.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/jojubenozoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=esl+who+whom+whose+worksheetPDF 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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 10176 bytes
SHA-256: 469b53c7074c0212ea712b15e4824e04f6681c7fb5e3d9c544b6fcc00c88e28f
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 19736 bytes
SHA-256: 6198daf8292628d9bb0a97ee45afff2f1e4075b3e9506e4862192ec7a40305ae
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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