Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a81d87aacab004…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 21:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d11b2c6c2096191bcb6af94fed7a6e1b SHA-1: f2fa7e13d2d56aa7d94085a14aaa1a04914eedaa SHA-256: f7a81d87aacab00434fc6a7c6557e2f23f6b6ec991a49fe558c330e76e2b85af
116 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm distribution tactic. The primary goal appears to be directing users to malicious content hosted on these sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7709cd986130c3c1554df8740b646619/51876289832.pdf In PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/a5b3d2ae9c2ef24dfaf48c8052a328b1/693944218.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0sqvqlp5codb8gjmfkrpelta9/basobo.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/bidojemetonos.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/q0gls5b2424i2sugl269bm7p80/93791536789.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c07f28c19---16965253436.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/bazowukedus.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/dunilapikutusabova.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f428028674---77159070929.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2236b4474---lazupudud.pdfIn PDF document text
    • http://wenxuezj.com/images/File/vipoxuv.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/buvaxevajuguwajod.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160738db5e7792---zapuvaxedu.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/jodele.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/68213049546.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129abac82307---movipujexiwima.pdfPDF link annotation
    • http://locnuocvietmy.com/Images_upload/files/lokaboxumigowetaja.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/42036077175.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/42611811351.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/398048015451620484292.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/21847832267.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/22780267128.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/reketegazove.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf103e445f---muboxumup.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad899f40495---mofugovijozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=rapport+de+stage+3eme+informatique+pdfPDF 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_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 11256 bytes
SHA-256: 5990223450d9a2a7db766222da34e5d4f70798eb736e87cc306ff3920574d459
font_01_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 19548 bytes
SHA-256: fe8883bb93899f512d956625ee41ba39eb4e1792868e4effc2e1793da284c8c0
font_02_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1