Malicious PDF — malware analysis report

Static analysis result for SHA-256 b369a3835f7a51fb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 20:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 31b0fa393269f9f4efbd702f765bea77 SHA-1: a4956524c2c6773d539dbb0c6854f59ed083bb8d SHA-256: b369a3835f7a51fb67333af896774bc2512efc8a96cb316c38f474da1a645596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crysiq.ru/uplcv?utm_term=keepvid+for+android+mobile PDF link annotation
    • https://nepalmicrofinancesummit.org/userfiles/files/jaxesugewevodowebu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19724f547---12681572111.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/sozepulabujebutezez.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/desogebu.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/fasujiduzuziromowi.pdfIn PDF document text
    • http://servmed.net/userfiles/file/zilimavegoxa.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f019887f2b---61408270428.pdfIn PDF document text
    • http://devison-matras.com/upload/file/bazitugif.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/gexexajiladaxajopip.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/61844379838.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/12580078588.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/97444483106.pdfIn PDF document text
    • https://33mobility.net/uploads/files/xakixuxuwezeguwugexexo.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/64217467616.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/427f35bf484a6e8455a3bebf3f768d7a/81603101559.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a9859d6367f2306a4b870b443b7cd221/sevotobezej.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/47574546164.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/93775512358.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613265a1a965d---48499734628.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/fuxudejorikubinizorazak.pdfIn PDF document text
    • http://email-database.info/userfiles/file/xufisopatarobumotirik.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa39033bd---16650737189.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091018104821268.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161312bc0a5511---bomomiwumaginenovosejiri.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/80128579925.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/pomabudefupavul.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/jerepevedasuripimo.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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 17520 bytes
SHA-256: 3ab0409d2e1ef3662d7960a54be9cfef242c391787d9210cd21f1b147b2cf547
font_01_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 10592 bytes
SHA-256: cc74507d99729aa4403a58e14aa3b034cd5dfd3a25238c53345fc655f0f29159

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