Malicious PDF — malware analysis report

Static analysis result for SHA-256 f192d2c776deafb7…

MALICIOUS

PDF

93.1 KB Created: 2021-09-04 15:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f2cc2ccaa3f287d40b53b3036f8412f SHA-1: 0c985de493d2df0f236d0d4f30f96a86255aad58 SHA-256: f192d2c776deafb7da5f4209e2359399555a3f759307d0b7aa731e635c519e97
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 link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1bb223d9---42596185262.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/43a8d939f5c52cc5a9dc67bc6942974c/rasef.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/90514152111.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lutonudekome.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106051815292175.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/tegujugafovakikuxuf.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074855f3d6e6---3622303348.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/85393471944.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2062cc969b5fa47aff00e2d1c586a3b9/vadizud.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f81504250---papabaxalopa.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082c34e3a39a---dozujo.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/bosagodewuna.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/rerukanuzupif.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zeborewelijejitu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/67826353245.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/40267915934.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fd29193f9bb5185f6df427f831e5b631/nuxux.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610d72af4d02c---tadukopumesivot.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf582bdba81---57011139465.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/af2109d1e4e7ee42dc536aa17ef60ec5/98729086542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=el+filibusterismo+kabanata+1+buong+kwento+pdfPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/28458780887.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_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF3 11296 bytes
SHA-256: 68dbf061ee606b7e674a26c854a200fbd2865024f9a058ed9546d32198149958
font_02_sfnt_off00013a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A24 16968 bytes
SHA-256: 88a482414e967ee03bd74f606b74e0ec1059f13d3ede1c652fe8cf5332073371

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