Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d97185b00c1bb99…

MALICIOUS

PDF

82.5 KB Created: 2021-07-21 13:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a42865c3e4e71d33e867743a934f439c SHA-1: 892e2fa5be5ee9eebd349f22e7e0ca671da70b9b SHA-256: 6d97185b00c1bb99c84a6f1a6c5ca86c3ab10cc8a544a0cd0c0589b169b2a011
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious files or redirect users. The presence of numerous URLs, many hosted on compromised WordPress sites, reinforces the phishing and malicious distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/83628b64acf62cc2ebbcdd5b7c0bfdda/judawesomulexoz.pdf In PDF document text
    • http://raczcsalad.hu/files/48342247180.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/7172217353.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/27126743973.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8153db6b---lekovesavatonijixodizu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1e55d61e9---33258415355.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/14ee1178ee64cec557356116d1102ce9/4742296053.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/bepisujixunaku.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe6ba6ea27---68286904066.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa34de7635f---69628134343.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2c8ffa5a606349a38adbbabd70ccd98e/80006839491.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c959dea5---586516313.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607197642002d---75928505151.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/58078043985.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/vojosuduritadilumidufinok.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/piromaruluko.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcfb3467b---62304820992.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/bebabajevokufipiru.pdfIn PDF document text
    • http://mopron.ru/upload/files/zifujavedokim.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/57135490429.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/75686498936.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/nopaxazodagopapape.pdfIn PDF document text
    • http://regcureguide.com/files/files/wexadivupofig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+old+chequers+gaddesden+rowPDF 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_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 10752 bytes
SHA-256: 52dd23deab4efc0d6778990d58a59a163fca2cbff4b2edb26ecf9540a0c994dc
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF9 17348 bytes
SHA-256: f3730953e40f439483b9fbc499bdab77f3f026b98575a7fac0fe244648cca27d

Open this report in the interactive analyzer, or submit your own file for analysis.