Malicious PDF — malware analysis report

Static analysis result for SHA-256 58475bef8d18de73…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 08:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 320a7668248722c33cce9fac0313ffe0 SHA-1: 031e73ee30c511b9e04041ce38e04097a5dd5df7 SHA-256: 58475bef8d18de73aaa14402e136373237ae9f2dcd3fa55c5579a6ce6c4352d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. Heuristics indicate the PDF is part of a link farm, with several URLs pointing to compromised WordPress sites or disposable hosting, suggesting it's used to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://grupo-kayros.com/userfiles/file/gogaxoxubapixidulakumige.pdf In PDF document text
    • http://chicohigh1987.com/clients/47015/File/fegonuko.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/nozaxitidagejagiregij.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/3077665012.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8cb47c9fe---80152532483.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ed914108c67---ziret.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/7557902238.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c30db6a7dde---kinimimojiropidavewukuki.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/sufutafefej.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/sonebobafojaludipoxir.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/sogezudaxiribetose.pdfIn PDF document text
    • http://kasargod.net/uploads/file/julogez.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/porevajaxemokin.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/444f5250ce7beb2c8525ea988b798728/dazava.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/davenanubelebi.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/738222360.pdfIn PDF document text
    • http://primaneighbors.com/userimages/ludodup.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c315362008375b8862ea71080213b064/98116678718.pdfIn PDF document text
    • http://brenderup.ro/mm/file/noxoguluwufu.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/zopalatara.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/vapironuzitusotewuno.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/panosi.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/genesuzufirepasewo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e02e9b7fc---66396697138.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d792b8ac---kukotorojowuzone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=acer+aspire+keyboard+functions+manualPDF 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_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 18712 bytes
SHA-256: 0bfbf27d1d6c6804f9a28a35043e0fb1e31efa911a70ff15ce54dc7203ece32e
font_01_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 11208 bytes
SHA-256: 629d16fcfa96b8e712f5740ee78efd34d441af39a91bf90880c2f1d1aecec79b

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