Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a1285f664838c8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 05:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65105e2d29e56ec8c77cf8bbacf08e97 SHA-1: e929c579a019383dce65786511f07d1eb4cb9bc2 SHA-256: 90a1285f664838c83c4567647a92e309a22515f59311286bef5fb985af71dff3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to external PDFs hosted on potentially compromised websites, suggesting an attempt to distribute further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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 http://www.multigacos.com/admin/uploaded/fck/file/11657041676.pdf In PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/14584155430.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/79371190463.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/xofuxokumajagegokuxexu.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/kilebal.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f077857bb6---redaluwotajanozepajimuko.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2e61f3a1---64651310092.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/61925700841.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/17004429670.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/58892087254.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/ritawuligij.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc9677d9d---zukakumesuxajubojugu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161329cf35da55---kififoxobemub.pdfIn PDF document text
    • https://mytopics.it/uploads/file/lesum.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/lazuputarosaniruvavununu.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/96696393223.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/df772f70d55bb8dbd5f078c7f4f1d6c4/30393626290.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/nidutitutuwivotafi.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/kemaluduselapulap.pdfIn PDF document text
    • https://signika.pl/Upload/file/voworoxejibus.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/nofogopevitosobaduno.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/xelenikiluweliso.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/31771988079.pdfIn PDF document text
    • http://fxmeat.com/upload/file/4c1f2848939815136169a71994268110.pdfIn PDF document text
    • http://didula.com/img/file/91829246782.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/eee2159332239951810b7df2149acd07/72080730264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=machiavelli+the+prince+pdf+downloadPDF 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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 10696 bytes
SHA-256: 271b64011e5312edd79c36b5566ac8a9e8e6024b3eddd2b2a455ca1f969cd0be
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 17504 bytes
SHA-256: 7f77ed5ed44b437ce00941d27c575df821f6056f5c7fdbf9a481b751fb34a271

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