Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd1d05d423e3913…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 00:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e0fa16192e6033cb105eb189e05f6f07 SHA-1: 8fa500e0ece4f24197dfe738ba35f601bc4ec269 SHA-256: 9fd1d05d423e3913f8164cb730a3904957c0cc479ee0b04ef88eeae9d40b488d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier indicated high maliciousness. It contains a link farm with multiple URLs pointing to potentially compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://thic.net/plugin/ce1/ckfinder/userfiles/files/29845293550.pdf In PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/muwezoxifeta.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/86339333076.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/radaketutelizonuxu.pdfIn PDF document text
    • http://krupongs.com/images/file/84154094031.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/77a960fdb230140459db38524117b4d0/28219395819.pdfIn PDF document text
    • http://szhlfz.net/upload/fogatoduzelonaziguvez.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/31205845726.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/19389751812.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/91674728293.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/56255176065.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6eca939ddddc5fd1644ced456a217e1d/netidalaxugewowitapopu.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/xuruxidele.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/zugobanujejejirunifo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3c185d640---jugurubuxadataniwod.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/78124063829.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161401633b3342---fozuxapirogigubidejut.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/besepofosixabevifavemeju.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/zopopulif.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/28385774811.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/47591193439.pdfIn PDF document text
    • http://orenprom.com/img/account/file/rotijiginej.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/tananidikurur.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/13456207708.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/44394019171.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/wepulunef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=s10+screen+too+sensitivePDF 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_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 17220 bytes
SHA-256: e1c074b17781f8015faa9d5e04741d7eb42ba409ea8eb21d7ea5495874c1fd55
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 10332 bytes
SHA-256: 658e263fb7cb66dde6eb27806e85f1890eae665a6f9235b7bbe3dd7339ab964f
font_02_sfnt_off0001179a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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