Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ff892962433e97…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 23:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53de28af73ddd6339ff67b2f6988a43c SHA-1: 8a8e33237b7bc0d3af5010e7c78343e22bc810b7 SHA-256: d8ff892962433e976f4c8c22c9e031219a6f3d5f5eb141c88d4f8e41ec7b5d23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the presence of numerous external links, many pointing to compromised CMS upload storage or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sashtraayurveda.com/ckfinder/userfiles/files/92218235388.pdf In PDF document text
    • http://medicamarsala.it/userfiles/files/39313691479.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/82635699328.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/mezukurigasu.pdfIn PDF document text
    • http://jarosi.hu/files/file/46668949202.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe4737c29---gobulewujamujijusag.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a543546d85d---mogabivusodebod.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/besuwesokolamojunop.pdfIn PDF document text
    • http://indexone.ru/upload/file/46153817531.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/40460652702.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/lebewolasorizosodus.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/0052720f318afb5eb6da6533feade56d/85942429316.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa5c87d32e---93727067010.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/48680737614.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/2jojmmui6rqo83ssv56jj2rl67/xiwujulokeduzinagitumepam.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e88355800---xifojipuleranisosaridep.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd059d134be---pipitowojo.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/3806529431.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608382820b8d9---43273705686.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/17784696441.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/xufanibi.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d7f867cba352f55df83679f884519dfc/jopaxisakafed.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/4420c7f658b65eacaa2c6664d7e5a501/mupedo.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/36535730639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pdf+create+index+pagePDF 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_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 17772 bytes
SHA-256: 5c827625c3aab78be84735afa6746bfac9428d9cc819e36cb152bda7b0026f2d
font_02_sfnt_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 10564 bytes
SHA-256: 05533bf773805b78f4d919fc3a51cbcc7eab0b395595754dad49059a77a96aa5

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