Malicious PDF — malware analysis report

Static analysis result for SHA-256 c738b844518271ed…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 21:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 61074ed9498fd1616c7a37b529beff08 SHA-1: ce3b3c43083880888d445b351c4592680f9732b2 SHA-256: c738b844518271edd9bfb3a96dfef235f21093707771c048c45d68895431d9ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF contains a link farm pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. One URI directly uses an IP address, suggesting an attempt to bypass domain-based reputation checks. The presence of these indicators strongly suggests the document is designed to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d9815e2d3a20686cb58f2859eb91f509/gepagazapodave.pdf In PDF document text
    • http://soflacops.com/clients/83266/File/megugefosudumosi.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/82251183639.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pozopumadiwipepawiwufa.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/96342003453.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10734818317.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fc81b1e8b5db96272cabebfa6c0cd013/mifuxisosezatalipe.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/toxowiwinamudufinabobapok.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/tuxojelabi.pdfPDF link annotation
    • https://ecoledesgourmets.com/userfiles/file/50800699457.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/59311554914.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/33219692901.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/wunodugefikulezor.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/77b1348855ed603f1501dedae1b502d3/42254872574.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802a93db1e4---74525673206.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/01f532f350f88f6c208feae55f686f36/18998939464.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/43358841057.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hdt6popq8qpjv8vdn7d5toslg4/76128313444.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/14783342674.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/39254422094.pdfIn PDF document text
    • http://jn-zhsc.com/upload/28001184187.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861618e5c84---mewirogorafotif.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/806787886.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/b76bded0d4b5b71970a1dc7afbdcb219/25828435384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=improvising+medicine+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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 17468 bytes
SHA-256: 8221a9c4a391c885b8000b10057a44aa2d0948dcdafce7a22f888cd096964b6e
font_01_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10676 bytes
SHA-256: ae0773239031e60e863510bbe2c56e10abd431080a86295775788ba0edfe6bc0
font_02_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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