Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e857b61523b9b9…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 04:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed6d89a8831a1714cc52830d4e7b635b SHA-1: 334c3d63051682dc7b59e08cbe4cadf5191c565e SHA-256: 76e857b61523b9b912b3adf3a89fca390df339f0bc4ea255798ccb5eb75c7f75
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, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://rotang.net/userfiles/file/tapisidodexepavigol.pdf In PDF document text
    • http://timandlor.com/userfiles/file/zimoxatufozoragusu.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/kukabizexafejezufado.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/semeselezikipelomipotoke.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/difudopujekitofovoj.pdfIn PDF document text
    • http://flexa.cz/docs/file/23503427144.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/7506969727.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/vegupub.pdfIn PDF document text
    • http://cissi.it/userfiles/files/87078890950.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/82182112066.pdfIn PDF document text
    • https://duel.pl/userfiles/file/66164712118.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/pujeripowe.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/laxawovowag.pdfIn PDF document text
    • http://telektrans.hu/editor_up/kebotal.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/parujuguzedipasusen.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff10b46da7---84736593994.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a891fe962df5e0006e40d031881e23cd/zaxuwizeludumiwukemavenor.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/jukadejaripefa.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/rupesekawula.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/39507775431.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/xosimavegafewaru.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/47480386584.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/20324557146.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/gefiliwigopama.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3e91a3604b4311f95115ab18818e6c9a/82889057469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kernel+redmi+9PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/76755744956.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_off0000d0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E1 17616 bytes
SHA-256: 47be848170734494abaddc36be3ddfe22d04d32511f5fb55ba53743720032e39
font_02_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 10020 bytes
SHA-256: 89b484b97094983a90fec2589e2ca76b9e787d761034d33feaaa804a5fc4dd31

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