Malicious PDF — malware analysis report

Static analysis result for SHA-256 1864b5c552a63fc0…

MALICIOUS

PDF

99.6 KB Created: 2021-09-06 16:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4961c6aa40ce6757ee0ce58fa4530a2 SHA-1: b128f97faf44da94eba860c0d18f857682d5764c SHA-256: 1864b5c552a63fc003cf9e41078ee383d319ec888d74a478217bfd8ad3f90cbf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, likely intended to redirect users to phishing pages. No scripts were extracted, but the presence of multiple external URIs and the nature of the heuristics suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://archism.ru/uplcv?utm_term=energy+sources+book+pdf PDF link annotation
    • https://vrindaindia.com/php/joseph/uploads/file/jabenalotarorewidotiv.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c814bdd86---kumubozipakosaze.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/jetidiz.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/gatevakusanorovu.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/90978424309.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pk9sj3e468u4he2bavtfuopedl/bavubiwazupixefelosapipad.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/368c86a5bfdeb5307e69f065e956f334/46661551393.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/89524d487cefa40c27f71f19560c34a3/90195046239.pdfIn PDF document text
    • https://lesura.net/userfiles/file/renag.pdfIn PDF document text
    • http://atomleasing.ru/media/File/zepirekikepukifedudenol.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c327e29f915---40167956889.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59864e8b0---23768857158.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/67047123452.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b5b024184---38151589373.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/115483564161137468edf6b.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/zomijegupuguzigajeloginu.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/rewapuxonesazi.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/32555721044.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/6002506174.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe1233428---naxifavuxokujadab.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/kenefegumofimojitak.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95bf0d463---vubowenurena.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021081111312_1015920456.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/70412137365.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_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 10824 bytes
SHA-256: fc13cd9deadaef81589a4f8d43af0558fb2cedcf845d2d6fc29f86506d07b266
font_02_sfnt_off00014f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F79 19108 bytes
SHA-256: cd7ab19a2eb9ed31cc9ebdba1b2685c080748f61c297498b8959c850323cfcd9

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