Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8d92e06e0e4480…

MALICIOUS

PDF

119.4 KB Created: 2021-07-27 11:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f39872b46dd4eab2bee9ff78599e4c7b SHA-1: 1f66b40eb2f2ac7f7014bee5afe5d405a33cfaec SHA-256: 2f8d92e06e0e4480ebfe3676b9b3d5eb5f73227de8eb25284439b88e100a43a7
156 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on potentially untrustworthy domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://rotang.net/userfiles/file/75081742956.pdf In PDF document text
    • http://webbuilders.com/files/file/larokumolevunirepafex.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/nofataladuro.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/54198134907.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/43002187911.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0d3975fcc---72638787953.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/87818635910.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/83262991389.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ede4e11f011---91569390565.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/71610627909.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xakozitizokigas.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/31342869072.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/36785441284.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/nasusavowoni.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160800bd8e6387---17261263298.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf63b96fa1---98680826256.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5436af84---53114943208.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c665a1af8cc---witigomekutonugififexilo.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/85129008268.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c3f72369d---22786601350.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/50rvnlq3mpip2hvn7hpuntfnq0/41099905428.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730fe74e49b---gosaso.pdfIn PDF document text
    • https://denimder.org/resimler/files/56620835227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+chemical+structure+of+vegetable+oilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAD 18484 bytes
SHA-256: 5f99e864a29d3d214e7ffdccd0bcc3901ba55228056e37383361f41848092bcf
font_01_sfnt_off00016bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BAE 10976 bytes
SHA-256: 6e437c4b8e7ee534cd7b348039a9a8b504b2dc65129f8a1b7ab0ca191beb542e
font_02_sfnt_off00018537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18537 18948 bytes
SHA-256: c35c54f96bbc6ae037ca4e69581bdc162d3c669139f9b0489ee38291ef7f2fa3
font_03_sfnt_off0001b646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B646 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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