Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06fedb07944feff…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 06:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f304521f2d9667fae748124ca910d0b SHA-1: a52f562bf31005550b60a89ea1172f303303be65 SHA-256: d06fedb07944feffe78eaa1dd76a5fc466338e83cf3716a2900e430fdc0854dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://simonkuehner.de/gfx/userfiles/files/defoxivonori.pdf In PDF document text
    • http://studiomilano.eu/userfiles/files/2588409803.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210707_B6E9941239B2C75C.pdfIn PDF document text
    • http://www.moyekolodin.com/files/98991573776.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/zomerovadofuj.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/dowew.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/birizuwamuzigana.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6e328945---74106237358.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/1ecb46334c95d7f04ee75e2c77df0b75/37905836715.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xiwobedalilixaxoja.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/dawopobe.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/xinogofebemezubusukudu.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/suzug.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pj3qc698g6mr9o9027uchvpchc/rakamaxesenajinarepuz.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce8296731---12811516806.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/63623568834.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/fa462a5fd7563926a409788b059d3cfc/fawijasedavuseluzofitize.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/87793928766.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/39917252689.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/96532134960.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081322558201---zigagiwikatin.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ebdbf58a35---koriwat.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62d89c4b6---wagos.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620781745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=2003+cadillac+cts+5+speed+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_off0000e2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A5 11008 bytes
SHA-256: 42ca11befb81a7eda0d568c11ef558769163806f7d628e738860fdd2653d31df
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 17160 bytes
SHA-256: 9d070afebb0761976da6e2f1be41c3356fb96d74038f5d0f6c1d85760540b207

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