Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e3f28b0ddf514a…

MALICIOUS

PDF

83.4 KB Created: 2021-08-24 09:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4af0a68f883acb5bbbb4f63f7989dfa4 SHA-1: 90230f3ba01d3857f62e1667c7988df48f51876a SHA-256: f2e3f28b0ddf514a94b029d43b9d31af18a141da406c94e160c46f27324e5b0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress upload directories. These links form a link farm, a common technique to obscure malicious destinations and distribute phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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 https://crysiq.ru/uplcv?utm_term=how+to+draw+a+hare+easy+step+by+step PDF link annotation
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ece4d779---vaxiburimukaz.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/95727146711.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/30535807943.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/88251320144.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea5739e80---mopegavijobexidetikorer.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/wuriwatok.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/xabulowave.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/49629961615.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/86716381019.pdfIn PDF document text
    • https://dhesient.com/media/duretubefakoretabafizadel.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6ab9f4ff8e---56025071177.pdfIn PDF document text
    • https://filetorme.com/upload/files/56195641483.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0df1289bacbcf6758408962713718820/19570471336.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/52187313473.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/34130e9c84c49aea82bb423670f0657e/41130949464.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/84889491700.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/59135956674.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/95204815092.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/53183880055.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/juvunapewusolubanewojekiv.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/55nq2fviqmmumv4nl8pl1mintn/16976412648.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/xavakepin.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804c5948b8b---sedilutemamiredut.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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 16108 bytes
SHA-256: 225d32a8481a984702c78f2d7ac66319a2827d6c64a7b8fd435443b9084a5798
font_01_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 10576 bytes
SHA-256: 70e647c3a15bf3276833907951a9105cf5d87924ec71379aa540e5d8a2cc40d7
font_02_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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