Malicious PDF — malware analysis report

Static analysis result for SHA-256 2123d276e599fd53…

MALICIOUS

PDF

83.6 KB Created: 2021-08-26 11:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 037506e30d3c0fde1e747fa87b8cf544 SHA-1: d9c3126f8fde1a6bf818521bf3aab0b794190e7d SHA-256: 2123d276e599fd5307da74d7dcd0ed6b948b70645e791485b6ba2d7895fc74d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, characteristic of a link farm. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into clicking these links, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/cn7ejg86d5miu769t9d4eq34fa/fijolekapix.pdf In PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/gegukukozuxofirosivuwewig.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/rujofo.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gaporudererexebujo.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/merurisuxusitiwiredileja.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/ximeradesijufesikuji.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xifetudomabasuz.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zadawalorivezefuno.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/bureni.pdfIn PDF document text
    • http://bscartridge.com/pic/6391838599.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/werobogivujaxigupiworose.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/33321751736.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/75350903077.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/dazibuwoliv.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7decb02b8d7928389ef35616d2448b8c/revetukevesodexojetuwo.pdfIn PDF document text
    • https://ksa-machinery.com/images/file/34761855955.pdfIn PDF document text
    • https://curvy.tw/upload/files/60096768368.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c3aa55f156919de6d543a566c018d576/xagozubawetagatuxujinupor.pdfIn PDF document text
    • http://salkim.com/userfiles/file/45411730794.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/pubiribetadasefedolel.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/22528981641.pdfIn PDF document text
    • http://teakdeck.pl/files/file/geviderububuxe.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea0ad0326---mumokisatapevonuviloridar.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/zafibuxadekuxamokusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=monkey+cup+pitcher+plantPDF 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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 10600 bytes
SHA-256: aecc40dafcd2dbf9019195ceb03abaa0f6a4a99d05a0045fe6acb9f7fad5f237
font_01_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 17148 bytes
SHA-256: d97215bfc6d499f09888180d93e7a174bf92e8928220e8bcb21c0c72a945227f

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