Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa2c6a6f9e36b1e…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 16:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7987bba06a805a9a070ca2c3e83bfdec SHA-1: 24f2ec7fd82e18b11d397e4ba7e0334d045f1f1a SHA-256: eaa2c6a6f9e36b1ec2c0a4a6f0e7a6a9c89f3d324332f559cb384143ccf47ebc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to achieve the malicious goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=nba+2k21+mod+android PDF link annotation
    • http://poiskvod.ru/images/file/97514843785.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/951122107.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/34021973564.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/lovum.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/93026497637.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/af2c6421e4a6808502e277f03aa16be2/67219879105.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/vogegixidakiruxuxubiv.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6dd2d1c158c127fc158fd72a39fae08/jabatinuzijuvazok.pdfIn PDF document text
    • http://safarang.com/basefile/files/dapojipalozu.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/ruzezozovad.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/pomevuvejar.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/bugiburu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-3/20210903204601949086.pdfIn PDF document text
    • http://faradbox.pl/files/file/21986283988.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/88715126176.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/69928382482.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/lewogowokipaxudov.pdfIn PDF document text
    • https://fobh.net/userfiles/files/16497345109.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/81126153552.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/951b4bbe9dbe1f6a3ca45dcbdfbd7cff/78801708547.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/fuxusopobo.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/8694336436.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161324bece57ab---satebotukilufapof.pdfIn PDF document text
    • https://12tiga.com/contents/files/17345376787.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_off0000b1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B4 15752 bytes
SHA-256: 11e9758725a787574d9787e195a7a7dc5978f6005bca69f5eb8340207b448028
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AB 10348 bytes
SHA-256: 6bc0234bce68e2e99a8737d79508321bc300bbc6ca321be663dc190e13420c31

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