Malicious PDF — malware analysis report

Static analysis result for SHA-256 369546f7ecfd6494…

MALICIOUS

PDF

74.6 KB Created: 2021-09-01 12:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf5c2bd3fe3f56aa5ab00df5979c27b8 SHA-1: 106e38163cb27443a8976951d7e917cf905c82c7 SHA-256: 369546f7ecfd6494aecc1812a5b298ed64b3fb43774723dea0369e5f2b7198cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload storage or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/zokigati.pdf In PDF document text
    • http://dobrejaja.com/Upload/file/75371612728.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3256309e---deputitumamajinunalipi.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/jipuzowusuvogolosowoda.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bibetab.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63c7d3fac4---25147145746.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/8396788196.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cf26223ab39---laboruwatezalafeji.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/75502616104.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e4d7f87e---89876489373.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/tekumagivewutikajixubo.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106300328204765.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/35ac008bd5dd6a14c0f32952233837c5/45377473405.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/xelujevilameruxurus.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/08a22ff4ad1af43edd06178db949b491/30558037041.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202182264735473.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a71705458c0---71691290191.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/sategad.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2eb679c3d---zemeketefeboje.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50eebeaa6---9190767173.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607403ef92f2b---58027603453.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/95607673447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=soft+water+to+hard+waterPDF 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_off0000c24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24F 16920 bytes
SHA-256: 156bb15d5170e575e2ae875ef0460e952f6b536c34a5fecc76d569b00fde70ac
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 10204 bytes
SHA-256: 7b9a49c660035d6fac52b587b1749b8da3f39750b7bf7830b3fb977d30834783
font_02_sfnt_off00010413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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