Malicious PDF — malware analysis report

Static analysis result for SHA-256 626ca8194fe600b3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 14:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 656a83af253fa15f0ccf9b8529ecec27 SHA-1: bc0405296c521051d3dc5cee15f4582f1a1df83c SHA-256: 626ca8194fe600b355fe94d53168343f31186fb1a30461e2fe01aae03e2f2bbb
164 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 with high confidence. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The document also includes numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/327dc0a20fe91049d35d731d3e148174/41222739855.pdf In PDF document text
    • http://susanirvine.com/clients/82887/File/91493412963.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/60193210532.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe958ac86---57127987530.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/monexasagabebawi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/71664a37ff8dd4308ecc079734ae4ea1/20973413397.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/xolobinedekofa.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092af618b9ce---7115418280.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/24774099523.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/defede.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/35599636136.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b619eb95---fagekojanokanelesib.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/nebumu.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/44651745626.pdfIn PDF document text
    • http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/wesavo.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/11109138383.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/dojojasofolufovigonabove.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082bdabe1ecc---serativebimopa.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/xewewiwawuwenajaxazig.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/retodijenix.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609725b97f492---vosakajad.pdfIn PDF document text
    • https://digireg.cz/upload/21271014787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=phases+of+curriculum+development+process+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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 17232 bytes
SHA-256: 9048eb562842ccbc7aaa7d1cfc049335aea97700312eb69e6c89970ed556f78a
font_02_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 11052 bytes
SHA-256: 099c2c36c5166bc218d5bf8a3e6e9663dfcfecaf0e8823fc6b1cd1c110c51741

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