Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdffd89f0c0e8c0e…

MALICIOUS

PDF

84.9 KB Created: 2021-06-27 12:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0b658157ad1cf171512e865c4cc97ac SHA-1: 8303f858d959b67449f988ac997617240a06cf76 SHA-256: fdffd89f0c0e8c0e50d2d23791b3f9fb98ef4b386000ccdeb431cbdce35647ff
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, indicating a malicious intent to redirect users. The ML classifier strongly supports this assessment. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a campaign focused on driving traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://runningrhinelanderrabbitry.com/clients/875187/File/gelitusuwokojisu.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160988c8530dc9---teremo.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ael27ksg47t2s9l5c5qupcrqlp/38560811164.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b7701d60d1db016fd2667675add5938c/tozomadivapibuzoj.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/2ktcgkvvttesg4mm86ueltrnit/xepav.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6af786d79a---23040481375.pdf
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/gamabanutafobevixubaxosov.pdf
    • https://coastalstudio.com/images/main/file/86509188922.pdf
    • https://akproauto.com/nbloom/fckuploads/file/29617978655.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/pdkauaq3hfnvl4vaegafrpilor/zalapomifaxuwopugimo.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a236550d109---68167916301.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7261c9de49---febataxarinova.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f49de6cd4---tawaxuv.pdf
    • http://multi-accueil.fr/ressource/site-image/files/vifogezi.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/mumiwedux.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5eb851968820d7db3142b4ec5d3e8555/zabitazudikibep.pdf
    • https://heatingboiler.ca/fck_upload/file/gitovepozeno.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e91073c28f06ea39473b85252f00c69d/viler.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10bd35d2f---25249023460.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jnm7ikvlglf6mh4epjs1omjat4/fojanifazuwel.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0722bbd669---41970588085.pdf
    • http://519pf.com/userfiles/files/68508161753.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3d10efcbd79f36d2acc7199989a7b05e/matutukelu.pdf
    • http://dlt-nkp.com/fileupload//file/97489614861.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=students+in+research+citi+quiz+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb43.bin
97bce6595a57a157a2d9d1983c1b167268520f9b68190445963da70b486f4d87
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 10768 bytes
font_01_sfnt_off000103e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 16792 bytes
font_02_sfnt_off00011bf4.bin
314bcd2f71f834ba59d3eb6934351dcb3cec42344314bef8e838cdfe97dbc65d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF4 16404 bytes