Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8b649c12436b31…

MALICIOUS

PDF

73.2 KB Created: 2021-08-22 00:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c34ec03b8836a39f0cf6139792b298cc SHA-1: 14b27ebf11b966b3006c305d718a43a035317238 SHA-256: 1c8b649c12436b3150aa821eb3d5ac591f0f1d5f2bc8ef72660477b476730ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/bnql78srcmt5p1vq8eormljrd0/nedatesafosoxevi.pdf In PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae664c27cc---wavege.pdfIn PDF document text
    • https://coevent.ru/upload/files/94695932871.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5785d8eee7c486b507ad647a55ed6afc/mixeb.pdfIn PDF document text
    • http://charivne.info/images/file/xotidipimaponit.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/golagikafixefudo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/98ac50f9de3762f677140d871c00d122/nenemidomejanedolomore.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fu18jp8lgqjl0qm48qe6pe7313/86915870375.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/rebewosilemibusavetixus.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/22409006940.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/600ac0ab904c1848b4b29d38b2435afe/99377070537.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wufutatukiruremowefibo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/39b64fec22f4df887bb766fcf5bc75c3/zotodolemopem.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/akuzurigefelemowudojugu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/parojofevivewomore.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/10705039722.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/rofikupakow.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b6e64b160fac75bed0653d003c6d90df/fisuroresexisuvuzimixi.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/92027216024.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/240ec09b33b8a7d2cfb3189e2c9af4c8/rosejusuxuguxupo.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/97323523570.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/42205665945.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/fidowavejorexepidimis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cours+et+exercices+corrig%C3%A9s+de+physique+chimie+3eme+pdf+cote+d%27ivoirePDF 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_off0000b885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 15668 bytes
SHA-256: f59449a289d0aa953436f3349d08b2a0c3ef53950286ba01490b4704b2723c5a
font_02_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 11676 bytes
SHA-256: 759f57004d369d3979aa615b048db201bde2491b09cc0fc1fe4f0fd40d64e69f

Open this report in the interactive analyzer, or submit your own file for analysis.