Malicious PDF — malware analysis report

Static analysis result for SHA-256 509db4c923e2bad3…

MALICIOUS

PDF

87.6 KB Created: 2021-08-15 03:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ddb708313e455d2e13b24c4e59438e6 SHA-1: 2ba46d736f242cd97ecf6edc7cc2f4feb0522a24 SHA-256: 509db4c923e2bad30cb0236e54a046b31b1783f5600da09545c48778cc5c47be
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or redirection campaign. 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 from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083713352c45---gazugikekotegegovifog.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/htj51q3j3ouq507i28q4a0s51j/30246400772.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/91163999891.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/dupajiserujokexufaz.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ace7f2f2451---gaxenogasasixos.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/fifole.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210630161156.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5c7a51bc---xirafijut.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/jorenufa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16076595bbcc86---doliwegavotit.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/59234233862.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f05ef5956a---vekubepugo.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/89561236711.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2e687f662---belamezupilamamiwemalez.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089c22bd877f---31778640640.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/94456655614.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c308792b---91220689267.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/4504109794.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/wagetanojozeraxop.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/mekokajuvo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c167318c---19416661911.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160f75f78cfec3---2580304055.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/57728790951.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/43351104658.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/satupetu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/n6q8g1fil01dp84aucnl4v20e6/16138425348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=guide+gault+et+millau+restaurant+parisPDF 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_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 19096 bytes
SHA-256: 8ac7c57872e485b91803876a4e216805818d3e2a4b2e87e74b06d4161d872385
font_02_sfnt_off000135e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 10756 bytes
SHA-256: a54f1b31ad1d776bcd565b98a257a7f477b4c8ecf0a2ddf2225a41036c51e980

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