Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5a625d74dd1426…

MALICIOUS

PDF

84.6 KB Created: 2021-10-05 01:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a43a10ce9bef10a66a54532a61f2457 SHA-1: b2bb1997fed543c17517b28103f7c10665592837 SHA-256: 6c5a625d74dd1426f227cef4a225207cb583f6cc71c4793bebf9dfb59e370763
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161586ab25aea6---dezimup.pdf In PDF document text
    • http://qdxqw.com/uploadfile/file/vogomawugozimufagugivafez.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f32e87266---zibeziriwulefomewiwe.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/96594513588.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dfe9d3334---45703983531.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/jomirisuse.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/wukewul.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/lufojinoburopeb.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/82370627193.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210911_3DD46B2D60DBFBEC.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/35696400461.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/mepuxetowolutev.pdfIn PDF document text
    • http://willbramephotography.com/14088347234.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/wenagufizexazurimar.pdfIn PDF document text
    • http://etnorom.hu/pictures/58329560644.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/difudod.pdfIn PDF document text
    • http://beta-rc.com/upload/files/lowivivesuwifimuxan.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/kogarosemupifidosa.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/32289488997.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/tuvologibivakuzabix.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/9739571157.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/rajedu.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/nuzikorum.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051436161229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=rousseau+social+contract+book+1PDF 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_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 10652 bytes
SHA-256: 342e717b22a98c623d601067614c9ab339208ccf671ca9f1f2d41289c60c76f7
font_02_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 18140 bytes
SHA-256: bea5877d93fc7b6489823857c42907af33612bdd78f4cae5b7526466adcbc39f

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