Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4945f2063e574a…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 14:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c25b481570f148bfb4858103689c4555 SHA-1: 88b7fd44a77846ee12048353272216e22b2d426e SHA-256: 2b4945f2063e574a6756ba2bae42a9018e878505356bf2773614a6a3b53063dc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dermaktif.com/imgup/file/vexitokivowanemom.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8b957f06---bogar.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072566e67f02---boxivisexi.pdfIn PDF document text
    • https://stopserv.ru/files/file/28078152347.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d46e2958046---56624795983.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/40038929591.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae8c23c101---6146085377.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e3a7368c1759d8bd0158e2fa1991192e/83436156418.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/93236106170.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b75b31674d64c0b82b65741d693b9c25/39477824118.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/17272991663.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/fbade56c7aa8a2b969dba8c5673850ab/44907579511.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4eb82ade7fa7e65fb6be7e84f9c60cb6/58876971032.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/delejisuwurape.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f800714cebf3dc8539e3709941d9c310/98300862785.pdfIn PDF document text
    • http://sqx.cc/upImgFile/file/20210513175127.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3ef8255e---nizexanakelifu.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/wuxixevax.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e93500f77---2667862061.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/fesefexom.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/tovosili.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/13e68c44f4f4a7ee6d1680575771aba2/64775687062.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/1098878861.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/pajamezelagejomitegop.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c027eb1a02d---8604860550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=code+org+lesson+13+answersPDF 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_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 10572 bytes
SHA-256: 761cde7a15ad3d10bca639a65f24afc00b3d444e3bc8803015980f79bac3ddef
font_01_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 18008 bytes
SHA-256: 9c8b5e4d0669e3f9ba0308c57e0b74fb9c261fc04145f36ad2c00e68869b3b43
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1