Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2998b90c62593a9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 08:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba87cb5b24e58fb36f9485996fd881cc SHA-1: 8b5344dd2b4b0b4c5ff87184721b41cf16f17c95 SHA-256: d2998b90c62593a9521dc3e6637a9a0a643e2c1472d3f277b5671a8d660febd9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, many hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or redirection scheme. The primary purpose appears to be directing users to potentially malicious content hosted elsewhere, rather than containing a direct exploit within this document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://altelaw.com/uploads/image/file/neseko.pdf In PDF document text
    • http://debnine.net/UserFiles/File/rakusijika.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/lofosozuwezaposa.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/45426885302.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/11300735864.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c057b6dbc80---33985527660.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/zaneb.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/tudidomili.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e021cbb1b---32668630713.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b7a8e7ef---72897200277.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/22552635814.pdfIn PDF document text
    • http://iphysiology.ru/upload/zizixizoworusanazife.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/7ecf6cf337a89252a967fa3f8da61e2d/xovudogujolunenisusize.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/mqfaf79subu4jji048rrgvpel7/murugefozitofatonajusuriv.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/7a0730f35d5976d0644364992d8056b9/siwivijekariruzujupudin.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/wifuxogofefagewikujij.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161265f8ad4180---4229511558.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4c9fd3d4d---30571473833.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/0si1lt28m8bjkekofmqqq3rgm7/zanit.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff7399b09---malegofemuguw.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/53742118330.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/pqsu004b91502rtm4kriphsrhb/84102857002.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/rekabumoremapabunonenet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=elements+of+drama+pdf+downloadPDF 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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 17928 bytes
SHA-256: 2360761cd50b4be0b35b00186d55e96eba3e6b27cdad567f5eb71a50bdb9984e
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDC 10636 bytes
SHA-256: 7c2ed9e1e5ee5460fc144d1a7a97445e27253976aa29771e2724cbe06bef95d4

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