Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e51f5e0ad8fbf4…

MALICIOUS

PDF

93.3 KB Created: 2021-07-18 11:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd29f5acca0476f29d96fee49bb0a40c SHA-1: f8d82787324ebc0854a8ec3e808e1942b2c71309 SHA-256: e1e51f5e0ad8fbf4273114f7a7c9000b3f77753ffc836ec7c894b1b02e179992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2850c13170d0b6b4b314e5697e8a47d5/kiviponamerara.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d710f33572---81644201463.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbb42e3651---fugaso.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/ninesobukawuvokujarogobav.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/votoru.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3709a79963---74787816920.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a87c315ef18---30047199347.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b097fa47---kogijazabed.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/sisidopovagal.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a326dd3c44bf3aeac55f447c9a03adb3/4124679419.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/mugadunitewetinan.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/navamukuzozoxegebidetafap.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b270f9d7---84352956504.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hc8b0boa6223vvr324khvll25s/gipasopida.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/94008114946.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf465c4d15---83200927941.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f6644a59---zetajatojukaw.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/78160562522.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f936ced842---kopukoxivomazaxod.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/parezekobepotoweluv.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/71970864100.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/13244365341.pdfIn PDF document text
    • http://amdind.com/userfiles/file/20191579634.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f67830084a---sorojowixudegufugupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+most+dangerous+game+protagonistPDF 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_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 17384 bytes
SHA-256: 28bca6ff72d7a1c8ed3f8de1128fca873d50525981d76653e18b2eaba2474983
font_02_sfnt_off00014f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F35 10856 bytes
SHA-256: 1bc374f2e080e6dd0793d6322cc86c575bf86977196d41506b1025cbc139e0db

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