Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a98e337ff04222d…

MALICIOUS

PDF

83.8 KB Created: 2021-07-13 16:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59b6db7e17feeb09ba94577c7c0c9ed6 SHA-1: 6ed4308555b339879077540c1ddf5a41a5854940 SHA-256: 1a98e337ff04222dba12ed1280dafab1a88ba29d066333c143419c2520f50888
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://oncallanatomist.com/ckfinder/userfiles/files/ketemaxakibitapu.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/cee936278787775da1ac0e58268ae056/45490446256.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab9fc14ec3acabc6a1cf54ab047586eb/kasumeragupaxaxu.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/44429982752.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/mafojupezefejisanosit.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/553412a3d948bd8f3bc5fe16a0cf7d4b/57966162118.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/23498663991.pdfIn PDF document text
    • https://proxus.nl/file/xutasutatebowerawuba.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/pl8gualu447pl9bbbsk9sii6bj/resavigevewuseripotukuna.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ade634da731---11714584950.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bfb13cd45---nesapabugex.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbba23a8545---gisuzexamonoje.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/cc56dd6047df16e76ab158debaf5ce9e/33698824221.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b74113fa24---noxupowo.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/samavedovuwibapex.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926ec1c74f---31881876254.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/68056030276.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706341f0649---degokitezogikex.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc79ad9490---55964540643.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/31114806247.pdfIn PDF document text
    • http://skomi.ru/img/files/file/mebobisedutubivilipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=when+is+the+next+lunar+or+solar+eclipsePDF 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_off0000e6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FD 10664 bytes
SHA-256: 104a1239cb991c2f3c63ebc39ec3ec787a63de9f495827c6ebc50daea3e648a0
font_01_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 16416 bytes
SHA-256: 24eaca9857dfcd9b9422ead01d1b4c497a84db79bdf0ed765a57c2843fc2bbcd
font_02_sfnt_off000129cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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