Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e9ee27dc8569f6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 12:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3be4f8319aa6163dc2b0f724c0635da1 SHA-1: 4043cf53aff0e583c01e012d0e5fa2fda9b5f056 SHA-256: 53e9ee27dc8569f67a77ccf3deb106610ace2b03b403dc1c8ad49b7e9a302d11
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=menschen+b1+2+kursbuch+pdf+free+download PDF link annotation
    • https://ovistar-dz.com/ckfinder/userfiles/files/nakufirabadapemobavezow.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5ptsmhou0ujm4rcnfpes8q18mr/nijubizexotugekijofugot.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e11e685f4ab---61444917071.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadb4d5d3---bozip.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/37fbe5867d131ae8d12b1ca2807c7dc2/74056713900.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/taxuzogodafosomubunanud.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/75497404398.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/lixulidojij.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/5994608413.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/h0nscmqat161ps7tufueem3mci/sawadap.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/96eed6005973b4b1138cbd10c584a294/34575052031.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607346aea2a65---70367247668.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d09c97a07f---59950572833.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/68e4aeee0fb39ae155e18d2a726f2a26/4795326786.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/nutafewab.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/penoraweziwoz.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c429fcf3be---82322184998.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/kemota.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/rumimigijitularililikuni.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/putodifilewupuf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06d657de40---kazuvudajajinosusalit.pdfIn PDF document text
    • http://chinazzjx.com/d/files/14910022490.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f76fa8667e---397048616.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b8065e0fba14447205adf45b9e07234b/selifijixobukeguki.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/24581050236.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_off0000cb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 22972 bytes
SHA-256: 7f01b32836a0ce69c4b6aac9071229de1a98675c34be76abe8f6db2b42f9d14c
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 11108 bytes
SHA-256: e368b771042ca0dfc08206a8c3c7f93495e9abf6901ba9e9e8225e3ef309dabc

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