Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe24854e0400c0a5…

MALICIOUS

PDF

84.3 KB Created: 2021-08-31 05:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cb417f9356b41c70e7aca45c749eba6c SHA-1: f24233dd1cc80b13eeb625b036b96c832cde349e SHA-256: fe24854e0400c0a5a76ccc958aec43ddf82c61ce8c9423a9a815eeaaee9ca748
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting services, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://webinaris.training/ckfinder/userfiles/publics/files/tegidiruwiwediveto.pdf In PDF document text
    • https://basisangka.com/contents//files/zelalasujib.pdfIn PDF document text
    • http://njxinbell.com/upload/files/69179263697.pdfIn PDF document text
    • https://xistenze.com/files/files/jiwerejesodamubog.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d50a79d85d---60760576726.pdfIn PDF document text
    • http://builderall.info/userfiles/file/73146868706.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/gubirubegaxuxepoxonubam.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/vajenez.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2bbc4ad1c---54961631162.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/bekixa.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/xegewaruboriwabugiguja.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/lupigokiwazuxeg.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/madegemeju.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b3c099667a3c988d6bebfe8548bbbdb9/85316602430.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/35441872290.pdfIn PDF document text
    • http://teraval.cz/res/file/zawizo.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/nuvufolirozezedebaruje.pdfIn PDF document text
    • http://bakoca.hu/files/file/kurutobejalukokabilo.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b1f83e0c---11228745899.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/299260d407113038aeacc5b0339b5d7b/nuresoj.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/valetagoduzulewanale.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e09cbdaa5---nofadowikuju.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t3evrgen9k4jk4nocq1a04u1a8/98441304344.pdfIn PDF document text
    • http://sakem.org/userfiles/files/nexefibowatapimezibokewo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e780f0cd4b6---dakomewadumik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=omg+movie+flute+music+mp3+downloadPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/kawolujugewugul.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_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 17336 bytes
SHA-256: e1f23ca2f17a9cb8bb7ecfcb449199e9e910aca97b0d948c7ea98f6565e39cc4
font_01_sfnt_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 11312 bytes
SHA-256: 7e98eba9a42f1471f6bfff4a0bb80aac74b9260f4294f6535452345fef52c6fd
font_02_sfnt_off00012a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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