Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdea01efbd6374b3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 20:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5af95978d14c4511e75c16b6c9753575 SHA-1: 2100c7dbc3f0fbd128115a9158374fe7a3232d4c SHA-256: cdea01efbd6374b37b0e3b1f69c357a384d26c9e702244624ebe5c2df72f7bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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=sophie+kinsella+wedding+night+pdf PDF link annotation
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a041322b6---kurosuxexebonoka.pdfIn PDF document text
    • http://teplospectr.ru/images/files/49148229464.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/tufapupekikevikabemep.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6l3sqi1gu6qoa6eueftqtir3n7/sajatuvokakevujurinolem.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4d4da46f47b7399976bdafcb7c8230df/jorede.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/fuxudefawowosikifebekuno.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd00adef9a---jizuj.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/5a9e3d96220b25338425080b5f75e594/16576720836.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/30455335106.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/gdnv1i1v5u1hd6prvsifv134gv/tirurojez.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/94f742cb9925df7d55fdae4145753f39/togixizovufaxomugililixut.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608028cb9fef1---41956677915.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cf54ae277eb---7655225986.pdfIn PDF document text
    • https://tpk-m.ru/files/file/84202475034.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0a502842403813ae58378444343cbd74/nanib.pdfIn PDF document text
    • http://rnsnider-classof-68.com/clients/9/9a/9aaec9a1f64917203b32d8bba7bf2533/File/nesesuwoxufuxiwom.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/tevenodasavitugodiji.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/80244416088.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/vaxujewekobilinab.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a36f2b98360a0b01e1b5d847cd83a68b/3881068605.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/ht6hb6s97gbjcbcj7734mi8m10/nuradamuribaninivo.pdfIn PDF document text
    • https://andrejc.si/files/file/xoxokajawan.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/10323058135.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_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 18952 bytes
SHA-256: e0d50d280a2a6fa403128e629060ece3b4b8b0aac2efb64dda3777c54fa1a385
font_01_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 10932 bytes
SHA-256: 17b6f5dad5fc00d3fa4c8b82e851bb57f6382772fac5473171ffa1cb1e80282a

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