Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6af22e57dbc0d7…

MALICIOUS

PDF

93.4 KB Created: 2021-09-16 22:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 165f5877f22207dde734d0c9128a7359 SHA-1: c9b3440b7b04004c2b92634a5fab87590e5fee8c SHA-256: 8a6af22e57dbc0d721e48ec4f4fdd69e04d2fc3d0937b22da9e8a78e25082834
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests the document is designed to lure users to potentially malicious websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 https://synerhu.ru/uplcv?utm_term=free+blood+pressure+app+for+android PDF link annotation
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waziwutusa.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/tixuduzufure.pdfIn PDF document text
    • https://gangnampools.com/contents/files/82266588497.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/foduruloxomefufivala.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/jolewovupiwot.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/30397950757.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0a37a3ef9c96256db6901abd4ccde1df/21938930809.pdfIn PDF document text
    • http://clingac.es/d/files/bisizewufajoz.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/17b0682358717070ed3d25085c35c22e/5414487300.pdfIn PDF document text
    • http://gekon.net/userfiles/file/79668738205.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/88356818415.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fff0fcb054f71825f713caf3b3d24e7/tavepixorutowamaji.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/bodavijitowuwalajapavu.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/zegoparilazedoburad.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210913_B503B74536BA7175.pdfIn PDF document text
    • http://eichler-kammerer.de/62907613463.pdfIn PDF document text
    • https://luminex.pl/upload/file/85874486861.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f5237bb5---pitiwowupebubogix.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/133f62b347a94e21eb25733a92c2b492/fitofixovifupifose.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/jopejariferalebujutixot.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/1de45pkrv5lg50h8mdlasrnpb8/59803207953.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e28ef301ba80f830097106f2aac892d9/geruguvipidow.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/4920611772.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a44e573c24579b33376f7ba407e8ef77/gasadituka.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/rolijepujuzara.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/foxazerojixasad.pdfIn PDF document text
    • 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_off00010640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 18940 bytes
SHA-256: ff4a42def10efe2a89a94d54ed2f9125bd513553f7e278dd7c5fa2701e6e1986
font_01_sfnt_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 10612 bytes
SHA-256: 75127369336b58481f1f5c1e6e3813ba84ce669ab170e54b54009ba73caab0b1
font_02_sfnt_off00014f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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