Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ec0de21002e557…

MALICIOUS

PDF

72.1 KB Created: 2021-10-04 18:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d4743be2a5f625b81f0db1d012ebb8f7 SHA-1: 71865d74b4ae1eb988c4930deaea3f39b2696ca5 SHA-256: 28ec0de21002e557b3ff04aa441952813940af7df142b8b01a7d6bc166ab292e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate that this PDF is likely used as a lure to deliver a secondary payload or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/rupivewubikovitusizot.pdf In PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/94392591235.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/wenamanuwidobonek.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vemivukodupefojetepawel.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4f754f2ebac5fa542811661fe61bb890/78809654888.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/71441624725.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/548166877.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/pimepinazediwuvuda.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/789024ac6f02cfaad270295c52e20809/zowufoniku.pdfIn PDF document text
    • https://architektor.ru/uploads/file/62572301492.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/fikamanoxe.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/gujol.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/ralafasar.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kozevidisoxorovosapo.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/85352547957.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/68388095938.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/48481933981.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/61378083815.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/gibadilife.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/pulaxinegowadudapir.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/zafuduzawapi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/415653ad738bd301c84dd46a5aefa8a6/domiloxifadifiwavefekame.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/jalalajetovebuludazav.pdfIn PDF document text
    • http://sciattella.net/images/file/65759564244.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/revegoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=subsets+of+sqlPDF 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_off0000b901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB901 16368 bytes
SHA-256: f26d0bb9bdcac9bc073be6bef9ff612b47cced19f193cfaea8c4d263c79cf95f
font_01_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 10212 bytes
SHA-256: f482932ce0a2178dbe1b1cf2beeb7ad254cd23072511abbb8b384419fbf8eba0
font_02_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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