Malicious PDF — malware analysis report

Static analysis result for SHA-256 e921318afd05d888…

MALICIOUS

PDF

109.1 KB Created: 2021-08-15 01:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5d34b029bc19f6aa702353ea423a885 SHA-1: 562c30ed39f1c5673d11e8a53f6161eeb398ea91 SHA-256: e921318afd05d888fc064d7bdf79b16edceec7516ea9697cbf517950007e9267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://onishi-kyosendo.jp/archive/vixolu.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef806a012---53731549167.pdfIn PDF document text
    • http://renovator.cz/files/file/tunasejapanulegez.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/025a2035b06dffd8563672821324e549/86929837916.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/raxuvukoteriwipuru.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/62879184293.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ab0e0359aa17ef8129854f97b10add36/sajowakozumuxa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890dc83816a---95600952856.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07b2b2e5b---dotogitomuzok.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd32bc5e6e---noruranomiradogedos.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/72325976997.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5blmruddu0r83nhtnreilp5f8a/78984452027.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2ed5fa862faffc21e208fe74c5d3c4a4/mudewisuvunutari.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/71173400196.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9c2dbc065d7860719e5a1313f595ac74/15783129396.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/vanejesadiroladiroveje.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/12386646069.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/73911576435.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/11928637937.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c7ff0fedc1c653fb79fded5d58c3040c/11746278953.pdfIn PDF document text
    • http://hodori247.com/uploads/files/minododivigawagewupak.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/53822535370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=oxford+english+dictionary+oed+pdfPDF 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_off0001456f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456F 11140 bytes
SHA-256: af9eaba5cace890b2e5f27be7668fc50f81404eb75c9e9e10dc76c1c6a3d9d18
font_01_sfnt_off00015f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F35 17996 bytes
SHA-256: 00fa5f5d5d0ac9ec04f7208f510f20fb8a5c1a3ce3523333e50bdfcfb16786a4
font_02_sfnt_off00018e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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