Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc104600339c0b1…

MALICIOUS

PDF

78.2 KB Created: 2021-09-20 03:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 996a42332c6c9d036a44fcaa6927ed01 SHA-1: 37712fc16d0dcff0d7064fe86c25342175e6b8c3 SHA-256: bcc104600339c0b1db6edade1a0796e1122f22c91c96962f124c1b6f09741cb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple compromised or disposable hosting sites, one of which is specifically noted as compromised WordPress upload storage. These links likely serve to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=tekken+3+download+apk+game PDF link annotation
    • http://dptour.net/bot/ckfinder/uf/files/6553166801.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9c91521792d2e1c5e6bfe2e31c1b9ee4/refukexegawe.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210913204414_904052685.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/10104839124.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/94446646251.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/nupofi.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/55295844475.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/jumutemopubozoxurumozepob.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/85736891255.pdfIn PDF document text
    • http://hbaoge.com/upload/files/54995482062.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140931bcf678---74351280331.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/jatikori.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/44c6c68136b83b06d35b17755f3cf324/jorededitowafaxofiwusav.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613841b170d22---9645939447.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/8408570197.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/85638021470.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/73466176252.pdfIn PDF document text
    • http://formacio.fic.cat/uploads/file/36792407139.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/sukeponoropejesikux.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/giwafibazunuditavaguzajo.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/12399821340.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/89808671442.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/nogironoxigozikizigidimi.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/wopafog.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_off0000cd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 10588 bytes
SHA-256: b5e3706a84826db990f77a059f1f970dfcb2f4d01819c7571af53eb7e4828d9c
font_02_sfnt_off0000fd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7E 17844 bytes
SHA-256: 41dd7f2b56f57c9c739912f1cc742cf712c64685f16f48da44ba53048523ed25

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