Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58949fcee8e9101…

MALICIOUS

PDF

81.4 KB Created: 2021-09-24 01:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec4c439bd5994aa547f566df9eee07b9 SHA-1: 5bd85dd534f3a88f2c325afa808715b5faf34290 SHA-256: f58949fcee8e910127eb9e3b4c8adcde4904188720838be495b3fbdabbf70ad2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://savitaco.com/uploads/images/files/pagunibepegavigegu.pdf In PDF document text
    • http://na3.it/misc/file/bokenemafid.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/72185064206.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/zabufuzubemobunotonoda.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/nozilolojobadoriw.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a39ff33972894bb66a49b6285925056e/jamax.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/46547491774808d0e534b4acab94a3aa/tisekenafowukunela.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54a6dbf53---67670603623.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f6050b9ca955c103d367672e470f8260/saruvowetena.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/71820654906.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/97923138214.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/zuxugelipik.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/nq14d7pn7scd1babm4n9spu5o3/sonivafogekoxa.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/7234017411.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/32043612936.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161352dd8bc359---84967440299.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qjldop6u291nmn09u9vc88arv7/7523325734.pdfIn PDF document text
    • http://lachina.cn/upload/file/jabipop.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad90b53c59---tifufiraduwaziwi.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/libukuxubusajabexav.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/94683233854.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/fubatijapopifemizofe.pdfIn PDF document text
    • http://yztools.com/images/upload/File/jotupiziposototolewoko.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/jeparemof.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/mubokufudotak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=river+flows+in+you+piano+sheet+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_off0000d5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 11008 bytes
SHA-256: 820817d3f617f3b7121300df73fb2cf53a3cd5e6b88b9f6cf7ce88720f5b9a7a
font_02_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 18244 bytes
SHA-256: 0d17022b6737bf4faa2b84f397590d8f7a3c8c7bb6ef6dd87f0944d6a222b240