Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea603a669bad8535…

MALICIOUS

PDF

76.9 KB Created: 2021-09-26 11:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64637f4a6ff02dac661d14f5883e1e65 SHA-1: c13d678fd5fe169b7702e1c0c0e1e941f33fa934 SHA-256: ea603a669bad85351bc2a5589b28c51d26b94f99735abec768106570cd44dbe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of numerous links, including those on potentially disposable hosting, suggests an attempt to distribute phishing content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/n9ipohrqs1es36i4s8739jtv0e/85347757745.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503397eccf3---kapodabukawimerog.pdfIn PDF document text
    • http://climtech.com/files/files/bipitates.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/tozanafivaxorejabegifat.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/rubeselulopipex.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/m49c5jgc97k5lv0a2bsqtkc4t7/62003028432.pdfIn PDF document text
    • http://fruitvita.com/files/files/29530203765.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/fonilug.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/rixevi.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/9a754f.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/16904820678.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/32rppa8hb88n2vkm337s03u8q7/33807387037.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/69683058901.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xigawuvazapasexumasulez.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/peduke.pdfIn PDF document text
    • http://husplaza.hu/editor_up/949596513.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210904100050.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/5978122210.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/fafuritemubipugowakisez.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/wewugezeka.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2586214fe---31165527807.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/69847348485.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/rorafogubirusogilesipopog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=annunaki+genesis+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_off0000c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04E 10484 bytes
SHA-256: 7c77a3ae2395f6bb8be38abb2bccf249658f6fced780f1194e1b6f8e55b05f68
font_01_sfnt_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 20768 bytes
SHA-256: 576329066910d2447648e85faf3df58acfe78ea1c6486aff06a0b445f7c82e66
font_02_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1