Malicious PDF — malware analysis report

Static analysis result for SHA-256 307c73c7cc3746d2…

MALICIOUS

PDF

76.5 KB Created: 2021-07-04 21:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8314657b16a3d31ae121048d7632ed41 SHA-1: cc58cef53c83088d4b2470b7a130166c5466661e SHA-256: 307c73c7cc3746d27a81e7bc59113e98bc51bc422adf428221a9cfeb1a982829
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these link farms and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://autotrans911.com/thread/admin/uploads/file/15751135724.pdf In PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a29cfeb975---13869983947.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f20c5cb8c0a14ab337d386bf9a952e0d/fajobizig.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bl9rh4vqlc4f5s94798jbc5st4/67372869507.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1fetkv9dtv7ka5ojo6jfe3duqr/vanenubemijid.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d262628d94---susiboriwi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wokonefajasokixora.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f73daa76fe---monowanaj.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/dd054a6da7377ba9391938f955b8d630/tejogajiduxakexedobarad.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091da1450d9f---tajevaseni.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/fifanetubavanalefupa.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/26264127034.pdfIn PDF document text
    • https://artenika.pl/fck/file/zasegikesezan.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0c4e26f611e4bef1fef45554a01becfa/jezuladesezomiremuvudi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/togimugalemowesit.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c85181b8e04349cee24ded0bccc86b24/kifijamovalexuriguzeg.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/jalawinopujak.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/nasukalizotixanodafiz.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/ludukumalojupefetepinujo.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c594319dfb872e5f5493e58b0f88898b/90049714732.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/4990599545.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/61ed2edd889f753e04778ac8bd6957d9/jibawuwelokode.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/47744013128.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/45882399780.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5be428059---50133741846.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/tarorozetikofotaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+difference+between+a+two+stroke+and+four+stroke+enginePDF 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_off0000c796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC796 11120 bytes
SHA-256: 460f369c6029788e6ec430f080bf0edae1af56d5239e2f422b8b30fec29b3440
font_01_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 16456 bytes
SHA-256: 23431413dbad3c6b811923174f08309fb8cd8855bac1f538e7806868ace8cb2d
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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