Malicious PDF — malware analysis report

Static analysis result for SHA-256 977e4f1bc858f72b…

MALICIOUS

PDF

115.2 KB Created: 2021-06-27 20:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43bb29a16ac60868e99e5c77d3503cba SHA-1: 4089a0a1cb771505a83e47d7dbdb554994a56cf7 SHA-256: 977e4f1bc858f72b8df58ac8899dc14dc42b30dfd8d31659a5233c3549d03d33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 https://irlanc.ru/uplcv?utm_term=rene+magritte+most+expensive+painting PDF link annotation
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da8c152b0f---xavagedosumed.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/53561532754.pdfIn PDF document text
    • https://laps.pl/userfiles/file/52134076311.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1c19a5f106081452c3b92dc0e5f009c6/tatotonorinepapupaz.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c62dbaae441---mopexanor.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/2camsneveq1vcsfv07hi2n4mn7/werisoxiginovevesobune.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/77408242767.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/61248662552.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837827c7a93---25220497966.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gh17o32p3ltqq1p5bsla8nvfei/dudunomem.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/5660815155.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e8a1df2c12ba6a9c01a5ca41f27fcec0/30998079240.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sj0tf5l03ptndn4ufis7n6uo0c/76652014385.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/37797360172.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/buropufegajuwex.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ee3d3cd1386ce837671d93c425ebad4e/23062090693.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd16d47dca---zeguvarifeviwonamixev.pdfIn PDF document text
    • http://planetamama.ru/files/file/90227800988.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/30578e835ddc1386ae851345c89cd0f1/desuluwefusevefusobaripiv.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/melovufewumupef.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b89ce20505d3ab3eb13863689eea9898/64379261486.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7ukoak1p3pdpvc5t88maqrtar6/82494904451.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/96584936116.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/64797eedfe1147e957fcad6ee01cacb1/sogiwolakunozigefuvipa.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce74abaa36---kagizazatubibogedorut.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001527a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527A 20128 bytes
SHA-256: 69e31a30e8a15fc3fb9423193aee3184c1b57da610a5c512e891719842b0029b
font_01_sfnt_off0001860b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1860B 10764 bytes
SHA-256: 7ad2bcb41d0c4066a6cc06f224b91d4e3e3ee4bfd4c3200cd68a77913a0b955a
font_02_sfnt_off00019ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ED4 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_03_sfnt_off0001a6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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