Malicious PDF — malware analysis report

Static analysis result for SHA-256 220b7b26dada89fc…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 19:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 79bb65f7fee9de7879dde6d8aaeefe09 SHA-1: 9368408ca9d6f6f68c4472bc5dca314864b77a6c SHA-256: 220b7b26dada89fc3cb2b7851f1afc15b5098148ad154a899e09814fe75a9a2c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=angina+de+pecho+epidemiologia+pdf PDF link annotation
    • http://mgtofubbq.com/uploads/files/sosodozitotib.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0429b1bee---56338904437.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rse5rcqukgma5kotbrj0h608u3/paxizizuvanejedokorabul.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/58f4573f25b6cb17ca78a9f7425c5fe8/11590423722.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/vavudopexibazuzamurim.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/41609125200.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/00246f43f3da6b444e3d845e35f7949e/82709109889.pdfIn PDF document text
    • http://mariancozma.com/_user/file/46710986744.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a1fc40c0f690a5e1c19b35c298c905ba/2692485639.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j06hqgja0modmkmhf72qo4j1d6/taxob.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/keliv.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/07547aeba2446c8f3e1831a496d955ac/11152338064.pdfIn PDF document text
    • http://iltorg.ru/upload/file/79416290999.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/16938721105.pdfIn PDF document text
    • https://btegypt.com/file/vowifafaporogutawaxik.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/penefafabok.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/benunetimakogur.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612b516d4a86b---pasobik.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c9fec2d2f0a437ce5025cd3c46690ccc/13894446389.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/sulif.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ee1b2647---2371038003.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c891e5e3---jorutezuvepegunodepaxaf.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/1229603143610d9139bd528.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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 18452 bytes
SHA-256: 07a56be579a17322aa94f3fcca7f0f72d700695e63c574410d769e3e337ae713
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 10684 bytes
SHA-256: faa6e651bbe20990ad8d5a63915ad115d94c0cecc35c8c480b0e7eb41c1d6f55
font_02_sfnt_off00012b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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