Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c536eb193f2f99a…

MALICIOUS

PDF

287.8 KB Created: 2021-07-08 04:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4aa2ddf3be5251318f4bcfffa9ab834 SHA-1: ae3c258f0a03ec19cd4a3528467089b6307f4866 SHA-256: 7c536eb193f2f99a27e5ca2e997382beb61a2d849a5a1d04bd18704dfede79ee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to external websites, some of which are hosted on compromised WordPress sites. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document attempts to trick users into revealing sensitive recovery information, such as private keys or backup codes. This suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=unit+testing+principles+practices+and+patterns+pdf PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4048527d---nobap.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7b7ca701---pagavo.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/56679923331.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/85246351320.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1097f012c0c0fb2a5227978a7288d22f/pofunebisuwowofovotekago.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/foruxu.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/14500669239.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080746ff0932---josidex.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bece9416a71---65291779624.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/43671604358.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d25727bc40bf29054fc038eb53fa4398/zelajarujogunabanedov.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/sll1eagv9ot9nopvfif7piduul/diminojumomunusife.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a819fccc518---jixuvoxutej.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/1783182429.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/tanejenuvovilaguzi.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_off00040c74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40C74 10684 bytes
SHA-256: dd153ed3e0c160c8a221c0cbaa768779ccf09d7a78d87bd5f2ed4328b11e5da9
font_01_sfnt_off000424df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x424DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00043cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43CF1 19376 bytes
SHA-256: 6f93e381fe2323ad60bf69d8740536b2e9feda0f75411c79d2b438c44743db5b

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