Malicious PDF — malware analysis report

Static analysis result for SHA-256 198b5e9094a2e1eb…

MALICIOUS

PDF

106.5 KB Created: 2021-08-01 14:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dcd80a5aab27b8362a230ad9f47b1845 SHA-1: f560682cc7ee6444a2d73a1869f557c61fe24a19 SHA-256: 198b5e9094a2e1eb9e538a5d40b8f037ce58443f1a2a2d945ac1f358ebfa8ebc
164 Risk Score

Malware Insights

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

The PDF contains multiple links, many pointing to compromised WordPress sites, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of a download button lure reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mangmalungtea.com/userfiles/file/mesorap.pdf In PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/kiwezuxunexapi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882f057af33---gidebekekufajupe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e86d526b9ad76a993de04621c45a631d/34409713245.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b7f5f1a723f---60066880826.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/15g39qn8d6s908cpfgiubjf42l/sagopezoxojemeb.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b621e8abbb1---79192387975.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0a539242---diviwiniwomasudafow.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/889632383.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/fukurup.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30db31878---sugosaxotulezu.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/21349170899.pdfIn PDF document text
    • https://curvy.tw/upload/files/tuposeze.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c1e7e5ba9cc30598ac17a3cd860fddc/dabujolagol.pdfIn PDF document text
    • https://apizf.org/public/file/8032078754.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/wojituzuvanobikinilabo.pdfIn PDF document text
    • http://malifer.hu/upload/file/nulevib.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/60342502674.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210618223248247588.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/495a53a318d5276f4463682a063f55ad/ralidud.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/14048817268.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae71169ba8c---dezipivi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4c8db289---fekezapafobubesosu.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0c4441fa0---63388544467.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f8238ced78fbefd64ec4f104b0f86906/14937454175.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/vepafowolupu.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/53846016150.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lijug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sexual+and+asexual+reproduction+worksheet+answers+keyPDF 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_off000132c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C3 20872 bytes
SHA-256: 78d470afbf9d82034b939529d68dbea872931e85b72b1683a5061443cf30cd8b
font_01_sfnt_off00016894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16894 11180 bytes
SHA-256: 8f4df6ea1339205e37b02dba8adaa20feba18147d5c4c59632601ced1633c665
font_02_sfnt_off000182b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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