Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b444681a7cde0c…

MALICIOUS

PDF

81.4 KB Created: 2021-08-26 08:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3888139cea339f521a6134cbd65af6ba SHA-1: 3f1d689b316583478c0eede18bdbd6e4398b8943 SHA-256: b6b444681a7cde0ce644526b0c3fcec799780e7461e11d75756cee83772ac542
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=68+inches+in+feet PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4a2c5cbe074c65cf9871ecc14de925cb/4622824648.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/xibegijidikerojolopif.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/27896881608.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf06a0bc1---xewizaverifelatusudo.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/kepurodabipe.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/39308636531.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/30693695689.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bbd3552f17a3bdb020998283eefa2bce/66195634774.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/34571202133.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/sowesimazavizitadam.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960e0559d5---simesuza.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/60510598695.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f3f1da73---kovaxaralisusidut.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/3f0bd80057abff934f8c7826a7604fea/96041548883.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/fonigap.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ba0d50b1---95493750755.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/22694393260.pdfIn PDF document text
    • https://mollis.rs//files/litubifiva.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ctqi8jn6hd9v1bunpg2eqmf801/nusipozejewededuwigab.pdfIn PDF document text
    • http://ledson.ru/upload_picture/xasowe.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ldosn1la8ll28u1h207o72r950/6175506628.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/vinanurujokekubovu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f4fe2b822289695e2b1e7afc225e05ee/27425542506.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_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 10284 bytes
SHA-256: 775a4e27972369fb05713e1734d1bbbc3fd37732001a6f73588546c07f5c4e92
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 16984 bytes
SHA-256: 6c6b137d8f9854efd3a6381fb3819154df756934c7cca21fb03e0c9464bcf032

Open this report in the interactive analyzer, or submit your own file for analysis.