Malicious PDF — malware analysis report

Static analysis result for SHA-256 8346adfccfac6ce4…

MALICIOUS

PDF

137.8 KB Created: 2021-09-08 06:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1848822a4e32d009cb8e5d4c55e06cd SHA-1: fcadeb247fcd2fa352231c64a56958f845866813 SHA-256: 8346adfccfac6ce424b3cf5475ebe2f8d5009ac93ccb57dfa475b498a296e65e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://wastran.ru/uplcv?utm_term=energy+policy+analysis+a+conceptual+framework+pdf PDF link annotation
    • http://cristalensi.com/public/File/guvuwususurerapinaki.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b7db2ed212f16285f1c97c3497c602c3/78704012570.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/317e19c6705804ccc0237a37d213e07b/tukurobejasemirazewu.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f914741704ad24d4fb6f963d3ea67db7/nilaxosafesinufowugozoke.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/69380829677.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/27277657330.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d6c8fbede280aad1789a7a5e02a796a4/61576808387.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/96628299099.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075655a2588e---fotoxaborij.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610bdb27dcfbd---54983583920.pdfIn PDF document text
    • http://vce34.ru/attachments/file/madadu.pdfIn PDF document text
    • http://i-biohealth.com/files/89788943190.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b475d70e6c6e523d175bb0ab2bbb8f6f/64496860778.pdfIn PDF document text
    • http://uco-kampen.com/media/files/zomalanuzesokeref.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/21560088040.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/13639313458.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160720710bc3eb---tapufok.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc0e0bac0---36580606189.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/dagubujunerigosomuvoj.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/bolegin.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ffc7e627064f00df95aad6d2d3fe5d28/davumujarin.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/wokimiwi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b6e1c8e48---xijegesemejusixovoziloxa.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/44251567555.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/93d856919a0120570b23deffa88e517c/92439689118.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_off0001af22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF22 11340 bytes
SHA-256: c40cbf8c86f035568389021273729616e511503be85478a43c124f0b92f17dd9
font_01_sfnt_off0001c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9A4 20528 bytes
SHA-256: aced215b707673377a6cb0478a4a70b6cb9446cd01662428a0ba47f56dd763ad
font_02_sfnt_off0001ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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