Malicious PDF — malware analysis report

Static analysis result for SHA-256 100b38ba730d887b…

MALICIOUS

PDF

91.9 KB Created: 2021-06-25 15:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 302b31fd9f754d0188c4a0db537239fb SHA-1: 3f164d3a0d3fbfe8b85c0f202ea0d3eeeae21aa2 SHA-256: 100b38ba730d887b47d6b1d5fc09b65fb3641b4a0fae777e54f1e75ed434cb41
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple compromised WordPress sites hosting further malicious PDFs. The presence of numerous external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/1sqsnqfrth38jime48r2kfbuae/2034809045.pdf In PDF document text
    • http://work4shop.cz/userfiles/file/76520641793.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7cc137f430a040abc2feb77b126dc255/64587953436.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d41a2c3fa---jokesiwinekil.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/33b3613fd606b135c9bf9a2f742cc4d6/46289271493.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb0c98eec---35758331021.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8tlqqfam7uh6h3fcuq4ls9upq2/64546939679.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/zewasamojofaxur.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6ohuoq5lae272fhfv3ubvno94j/89242120231.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bejoferawimojibiv.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9e2915b854cf708d7f6b30b16a74316e/6171157076.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/sivuraves.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/553b7665a6320113898a6fd7df455d25/92131835688.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2654a80172---37445895095.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/kuvijoravibomuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=add+chapters+to+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_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 10456 bytes
SHA-256: 9324199d0ca02112f204dd469d60bdd7bc5262e333d0986f5e114ad35a718d46
font_01_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DD 17068 bytes
SHA-256: 5c9105f78601b866e0fe2e2c3b206187a71f8bf79ea9bb4569440de166dfe1ee