Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78faf7dc94bb019…

MALICIOUS

PDF

97.4 KB Created: 2021-09-01 07:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 38bd76b4c792725cf1b5a1c44e6f5442 SHA-1: 9e461bdf1ae01d95b35bf1b71496e0caddcc0457 SHA-256: e78faf7dc94bb01905eb1fb285c0678eaba4df8b21083e1bed45dbd10f08110d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. The primary goal appears to be phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://straps.by/ckfinder/userfiles/files/tobasinugi.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/820bf15158e08b98474dfc42fa488f46/75539779723.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kafqmfb7271ot8gocu8t9t111q/33770816451.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bepn8brm22u98bt2bvto00fai9/kerasavoxubetiv.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/9ad6d87bbce1104b77281372e8ee9e00/77954878016.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/91220226088.pdfIn PDF document text
    • http://wawa757.com/uploads/files/roxef.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/68998667798.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6ebe95a04---vabol.pdfIn PDF document text
    • http://15881588.com/ckupload/files/wujij.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/kaposirajuwas.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/53466699432.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/j9jkb0637tcnk5vpvdmji9lqqp/wafinaderezixiziv.pdfIn PDF document text
    • http://cy2hand.com/userfiles/kowukorisula.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2cbibmsofnegp3jqg4fsckrfdo/vemikinavo.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/kagodugisuzozowebulalekaz.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/fixopa.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/botarepelosopilofiwejorup.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/radikisilajuga.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/mowodajexe.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/9d03c7986fd8ba41511a657025aa51c5/wuritavutemifamifabadaxa.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/wazudubujulufamirisamovu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608318232b8c4---7996869861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=writing+with+stylePDF 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_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 10300 bytes
SHA-256: fc3134a2d74e4c9fd4560f2feca393a4174a0d8f04a2c86c0b16f5cccdfd6f8f
font_01_sfnt_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EE 19936 bytes
SHA-256: 1c671c0c1e2555f156fa28df6392d5d65c7b47502a05b4fb46d6e5e8c9922b86

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