Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b952e480c6ec9ff…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 23:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2342227a4a8eb450fb17fe718098a2f2 SHA-1: 915d8e6f782114cf2d12f5a281cec6310ba76fef SHA-256: 6b952e480c6ec9ff5ce1d4bd5cba4e666cfe36bc830e55eb92e07b528e1cc9b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://fritz-fahrlaender.ch/download/46966425147.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/98083171ed7a2b23cdfdf916d016bfa8/nerudejesuwutevuvofu.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7149daccc---73104662382.pdf
    • http://hum-lucknow.org/test/fckeditor/file/mofew.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc452f082c8---9098285825.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/61907120874.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2369da70da---39688007823.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9rf8ibcj916lhd1l58gj0tuan0/3872677349.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085537f24c2c---renubujafixezukap.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/bamipubukozuwopere.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/50l98j1vq9mjrh0t532rksekn4/63094634788.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/7d2fa941a76c0b41ea4e383b6ec4622e/92930636724.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160760ee0226f5---37366310297.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4305064b8---85359327335.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/cfcomtt88cebk9gsfq2sshgfo0/vurekanoligegig.pdf
    • http://frangarcia.eu/upload/file/tozafopusuvamewanux.pdf
    • http://darienhigh69.com/clients/866565/File/38487486071.pdf
    • https://nikosdimos.gr/userfiles/file/33634917765.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2379c2bf2e19e211b575c4a269b77bd5/xodalokis.pdf
    • http://bartuceviri.com/userfiles/file/22272684505.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/83791f640f4880c24662d6c2dbc70a09/jidavivovebikefa.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/83c9d33181ded3e35d62b2e8eeda62bc/99319730144.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e39cf00d---26181268430.pdf
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/16605719580.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3cfb97ab8---66166731208.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+can+i+tame+a+horse+in+minecraft
    • 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_off0000f384.bin
4bcebbc4a6185862a91203ff7a7665fef22447f6cb996099911544e566626c9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF384 10632 bytes
font_01_sfnt_off00010bae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAE 16792 bytes
font_02_sfnt_off000123c0.bin
37b35320dcccbb2dfc0eaabdb69b47cfe5afe2328bf6044ef62d986b3a848624
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 17660 bytes