Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9da9c183077b7a2…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 09:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 01878402169f4cb66a487dd1326d4359 SHA-1: dd7bcee960454151ac7446bb4c962b07175cab28 SHA-256: e9da9c183077b7a270b9bc6f4fb9a0c78ba1180ee1bcec251c0574a9c1da84a0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm strategy on disposable hosting. These links likely serve as a lure for phishing or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://yas-center.ru/userfiles/file/gutififeguvivivu.pdf In PDF document text
    • http://redeyeldn.com/userfiles/file/22325987919.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zukolutazuvorov.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/30814014842.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c5dfcbd41425a4666c654e1982b41f4e/73175149590.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/vifala.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/nikipezuwelevenero.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/57236728856.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ad6d7099---25491969167.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fj0dahgbs5pljqdh6k31v118i2/dewazoforowebijekuze.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/jonipemurudakevufopipaz.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/28472629913.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/weselopimetu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc45fe7e16---vivora.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781591ec989---33700297413.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/72660163798.pdfIn PDF document text
    • http://zerosquareonline.com/file/66343817278.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/lojekafufulu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/revoedeac1sgo9qcpfk1kv54j5/77907341072.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/76803717110.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890f353eed3---88292260895.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160738deacce6a---senezidijizukonoxujizidus.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/146185728.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077088e5e240---vewatukugorimuviluvedax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gold+dust+woman+tab+pdfPDF 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_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 18304 bytes
SHA-256: 6ebdd2283e1c1f294f90ccd3cbd81b2ea7005aaf22a59d632bbd3a8fd8860688
font_02_sfnt_off000134e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E6 10700 bytes
SHA-256: 858cc194c02685b773f92cf8806bab91d4b89a32d7ace5a91c37ba0d0f7819a2

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