Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b5a9a7ac994a65…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 15:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae4eaa64146c1d47e562d032c98d14d9 SHA-1: 287f0114cff8e9f043c33b2df069d7dbb8ec5919 SHA-256: 77b5a9a7ac994a659b72ac76a352ae1a765372b49b4166aed32544dc453c940f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to direct users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://wrd13.com/force/file/22031010722.pdf In PDF document text
    • http://galettedesrois.hu/userfiles/file/58702877249.pdfIn PDF document text
    • http://erimti.com/userfiles/file/41424707721.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc9fa5aa3e---71139823740.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/xanam.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/pafemoniviranilobixosug.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/28056937520.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb82cac3831---74521937665.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/47982830517.pdfIn PDF document text
    • http://nktrading.qa/file/files/75511625755.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8b9c08f3---fawazotupukenadozixexe.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/70707771152.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fd12e847fa9---gonudevosebogotugodu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f571b76181---misaremagid.pdfIn PDF document text
    • http://abnicum.ru/files/file/22955113965.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/1032191524.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/58275365552.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/79526194318.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/503eea9dbe1248d22a3407e1e9beaafa/89581773911.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/22r3bbkovkbkg2et1eb7rpere0/kexoduxuruturufawupuk.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ea1adb5985e2942f587e09c988a3caa3/58672049478.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/tomerupe.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/warepamonidupopofuwolob.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/zexanilowenoref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=squares+and+rectangles+worksheet+grade+4PDF 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_off0000db8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8D 17640 bytes
SHA-256: 14946df1e5aee56639edf0e1fd699f00f1bd8bca58b7169ac8a922925595b7ea
font_01_sfnt_off000108ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 11136 bytes
SHA-256: 24e139e2886d5fcb01076c72ef9b05a54825dbf45cfb0ee768e8195644950ff1

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