Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ca23bc2ae592d4…

MALICIOUS

PDF

94.6 KB Created: 2021-06-28 22:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83d7e59db493b19553a5f71bae9abb48 SHA-1: da755f75b09fed9835385624d04a02779b3e436d SHA-256: 83ca23bc2ae592d489717228014fe4b8f273ebeb6f2b1232a551fd362e4e65d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of 'invoice' or 'payment' language further supports a phishing or scam lure. While no scripts were explicitly extracted, the overall structure and URL patterns indicate an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=ll+licence+download+pdf PDF link annotation
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c36336607---58373154839.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/21953677595.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/59295945151.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb8fc2b60---moves.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/bexole.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2268f52b9734d8b5db7ebab7f40afb58/95240059836.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/bcade97ac79da2581b677eefab41b45d/duratunulomalime.pdfIn PDF document text
    • http://debden.org/userfiles/file/bigugediwugumiremafubuma.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/25529957253.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a810e5364a4---31687290248.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf29281c3a---bijib.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed20b530fa---pusasavijusenu.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1767705efccaa429491b8b423a1a8d0b/xader.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/66699711027.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bb5cd8346---vefaruvifebanuxijuv.pdfIn PDF document text
    • https://mmszke.hu/files/file/zolekogesorukamutufemuvil.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d73d07ca4a1---vasorebutirilakodatomitaf.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ad4a8e25---26456754741.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/vosapekuzir.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/86472384251.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/libubijemebisunibukutax.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1c357462b---83021028230.pdfIn PDF document text
    • http://camonetinternational.com/files/file/xulubotusijumares.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/80697152594.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a936d568c826d7daea151bf65f4cbcde/83893926741.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_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 10292 bytes
SHA-256: 17ebdf5ac367ce6f3f75ced7cb27411674b743524e245a09c0060e129a38fd6a
font_02_sfnt_off000140a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A5 17008 bytes
SHA-256: 4e63a7d4de452d395787000259bd13fdaa409afbd3932c017193bdf76ad3c492

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