Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae802e4f95f8b1b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 01:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c7b760645d1a521b8c971b827f069411 SHA-1: aa2415135efe7903d2eb8207227404055af1280e SHA-256: 3ae802e4f95f8b1bc9977bbe589170c337e88f1eb39440c3bcf1ac12b8559971
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URI heuristics further supports this. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=tubemate+app+download+old+version PDF link annotation
    • http://lev-steklo.ru/userfiles/file/rijudoletuzotetog.pdfIn PDF document text
    • https://mackbeks.com/files/file/48518060413.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/48949943558.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/buxiwigufikar.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe8c2e5c8---84413582866.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea78d759c---98379844473.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/sivomifuvadilikuwib.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/pefaxabemedabisafugowel.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/nafevazowagasomek.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/rowevoxa.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/xejajuposered.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/fegukodozajel.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/68456932107.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613728be699ff---rivodajipiwulafefexojigu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613907ed00772---36221761756.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/nevonejufubifujibipa.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/9905467822.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/kepegebigigoravekifotur.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/sosuxixewotaxitej.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/7387228382.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/loxizelufovedib.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2kiojlbhfj95cmj1c7t3m6pihn/42026845676.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/fobukoxipanap.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/muriwipewavoxoxinijixo.pdfIn PDF document text
    • 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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 17240 bytes
SHA-256: e0d53700e0673e6e73aa4197d0d8004d287f014de695d2709fb444514825a0f2
font_01_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 10908 bytes
SHA-256: 87d1a7a148c56b52b1707da42f092e0794f0c7dd53b0f4601cc56a3f046559d8
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1