Malicious PDF — malware analysis report

Static analysis result for SHA-256 7629c3b4fee82d96…

MALICIOUS

PDF

92.2 KB Created: 2021-07-26 08:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53ff3138fac52f17bddaa2fa9d327d91 SHA-1: 28f3febb2fac321e8e4fa36cfc4e0fd77e951e5a SHA-256: 7629c3b4fee82d963f552dd25792d905173462326e36c5142a65f9123094cc93
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and utilizing formcraft plugins for file uploads, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the primary attack pattern being a phishing lure or a distribution point for further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae511b64fa1---30461486550.pdf In PDF document text
    • http://esrafisek.com/images_upload/files/zakopu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806e7200b3e---pakopepedapisenana.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/cu69p73tvfj60q0c419nu5shuf/dexolasimokanekisa.pdfIn PDF document text
    • http://chayka-svg.ru/files/27854633676.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/lopale.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/niketotirulokix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090348110577---sevegulemazejobuw.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3e41gg7n9au4lnn2ep7tkg25v9/92061398795.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/cda7ffd1d7c303975771865e962b976e/bovuvaxevegetukomoj.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ba18d81196d---95172227990.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/57230679890.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86fd034b00---jusit.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/wafom.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/n0u37ruja5vg10itrjc9879mkh/29289591533.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/97950423123.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba7d027024---xisunonufezuzenub.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/96330564437.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hgerrsp0bedubsd6oq4tluoeo3/11735706395.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ueostjk3qvm5h4ihlastg52css/fagukevuvefufoza.pdfIn PDF document text
    • http://dakmet.pl/upload/37133562528.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b18f1b9c6---46140886097.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/sexaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+main+difference+among+seedless+plants+gymnosperms+and+angiospermsPDF 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_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 11176 bytes
SHA-256: cbfc050f0cf8790af3182f8ebff60cf104ebd4d3e2124da03ec47f562756006c
font_01_sfnt_off00011e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13634 16696 bytes
SHA-256: b670e4f55f7706855ef7f539e4ca8afd71676c2816f9f6b6bc4f792531720b2d