Malicious PDF — malware analysis report

Static analysis result for SHA-256 f344f4a848bd0abc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 09:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 580483aa896b030a4df05819b1214203 SHA-1: c02f47b4e1c228648727caae1463acf7c9aefa40 SHA-256: f344f4a848bd0abc3c530beecc023f4cf9d6c8493454389cd9e69b879d909190
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dui-antidote.com/images/userfiles/file/29685276843.pdf In PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/wolotexewoleletiz.pdfIn PDF document text
    • https://petala.gr/userfiles/file/xasabet.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/zufisotevesafiwan.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad61f1b677---deloredawavajire.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/85323212436.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/98409101590.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/luledamudizedivunapawe.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/10342306558.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/viwevirolepari.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf63db4f4a---nikopezakepizona.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/tevebebelosowizafijit.pdfIn PDF document text
    • https://luminex.pl/upload/file/nufobifi.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/51570518354.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a3ae7912cfd52cc512986db826684b5a/43859102049.pdfIn PDF document text
    • http://bulmarconsult.com/files/40791828868.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/76388428671.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/vumetagenotasovofez.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/fifelosawuweputu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecd7ead1c8---1482176639.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/gatem.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e736b49f2---segaji.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/97621224626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=i+am+the+beginning+of+eternityPDF 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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 10652 bytes
SHA-256: c3f72f51cdb91d65ab68321e7d60297aa726b6a6e6ee60c0f9464a693b2f6a06
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 18044 bytes
SHA-256: b9624efccb66211ef8f6f1f45947a76710339c2b35a9b51e104bb9a1ef81474c
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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