Malicious PDF — malware analysis report

Static analysis result for SHA-256 1867dd3e28954fcb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-04 10:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6ee013f01bb2dde1e1e66ab2af46f416 SHA-1: 055caafe2bff9c35eabe4c708ed02483f3cb54ba SHA-256: 1867dd3e28954fcb336bcf53b216682258670ab74f7aad0b624392650f3c2dce
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external websites hosted on compromised CMS platforms, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/n7t2hjathccc3hvtr5fmatgc8t/jewejam.pdf In PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21346418048.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/lsbmqesvfqvrjbj5sr705erj81/ketudew.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/6l0fvep5brlu2mp0s04vc0oh8h/45149322948.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a62519e8295---kavoruwabawojejejiwosov.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/731c2186a46c146dc9928822ea556e22/8667804216.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6148fe7da9059aeccd6714d1d70f95d1/jezalibomereneserimozatev.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/duvukepebiwigidepumon.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5f6d7fb3a4523810f103e638303a7c4f/nodumewabi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607395678be5f---pijagew.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/71005192187.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47a48dbf8---36216094036.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/273f338b5bbcdde11b43b9dfc68a9991/14354561764.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ddc222b2---wozanigapijexajopiz.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/pasadipudovibusexudokuzix.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/mufasu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe35b9c210---69495396343.pdfIn PDF document text
    • http://partnercable.hu/files/genozi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebf7e1b3c0---81516712882.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/mizokojetefunavalin.pdfIn PDF document text
    • http://synergyproperty.com/images/files/46471879651.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee35bb007---25690507245.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/laxiwojukidelu.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/vazelujabigixuni.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/13741783206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=adding+and+subtracting+worksheet+6th+gradePDF 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_off0000b6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AF 11172 bytes
SHA-256: db5f1fd55283362e3b0a90d4ad8b82c610dc78f37916b3dfd0c21dbc57ec1bfa
font_01_sfnt_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 14360 bytes
SHA-256: 02777d5203cc38b63e6224d270210bab5b5305999b4f2fe9b5aa27114e084bf8

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