Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3b8986af1061e2…

MALICIOUS

PDF

88.4 KB Created: 2021-08-02 09:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1f0796a4fd264cccd2f8675eb37220f6 SHA-1: 9ec08305e46ed6c233e046e0496c15e2d1ae011f SHA-256: 2e3b8986af1061e2fb6692aaea3b54b3779217ef15a507722e2af85809aed46f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous URLs, many pointing to potentially compromised CMS upload directories. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://candleelectricals.com/uploaded_files/userfiles/files/dumakov.pdf In PDF document text
    • http://abpaluso.com/upload/file/jakojefejajoroboto.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210529_062536.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821429d110b---fujozelilowodexatuf.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mqvmdgi193ku533rp4asfsqmp4/jezazapaxere.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/86d0904e9f1e26471ec85b6760869e49/86743480489.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c2a5ac9585d568cd11f1007a0a95d08a/99119733938.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/kovupasarabig.pdfIn PDF document text
    • http://iwishop.hu/file/ruwijegukefipafedunanimes.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/58121031794.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/sofijojoge.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/35512056692.pdfIn PDF document text
    • http://c-six.it/userfiles/files/48552751485.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/92381538602.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/10356311043.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609294bd0b14b---zituxeriwitosi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a412738536a---69273232051.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-10/20210710104846393020.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/42021217317.pdfIn PDF document text
    • https://aokman-drive.com/d/files/34306544913.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/6450581328.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608573a06d172---xewulerirupile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=5+out+circle+motion+continuity+offense+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_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 17208 bytes
SHA-256: 2c3a151e8e89e5caed15c6f6d393cf76a679e0f58db1272b91686732a28c569c
font_01_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C9 10872 bytes
SHA-256: adc6145a5b2f0731fbd202f17f94e850166cb9f65ac0fe4ba43ad50eda05d116

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