Malicious PDF — malware analysis report

Static analysis result for SHA-256 feedd5d3a4bcdb2a…

MALICIOUS

PDF

112.0 KB Created: 2021-06-28 13:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ea1109044120e0bd5675f91a412f740 SHA-1: 0806b4ae0b81b2dfdd7a48d2001bb6e99015071a SHA-256: feedd5d3a4bcdb2a2c714d9ed0be180fa7fd7fa11f2d0060325835dde40f9be7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jairdefreitas.com/ckfinder/userfiles/files/78671985229.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/46375192076.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b85b28b5e4d---jakoxovotaketesadopen.pdf
    • http://sy-smile.com/upload/files/xidaj.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b678e00115a---fezeziviwa.pdf
    • http://montaze.org/democms/userfiles/file/tegekimuxef.pdf
    • http://billedbutikken.dk/articlefiles/file/80198739850.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf24137949---lubexakedekidinoke.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c948dd5663---xakewuge.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1eb265f750758faaf468e83f37b28b3c/35038626733.pdf
    • http://brooklynsmokeshops.com/admin/images/file/24518850878.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe27a2e8f9---mipikuwabitarakazitadibip.pdf
    • http://rydelko.pl/userfiles/file/salanepexixasovesejel.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8eb614d5---52148449385.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce68d72dab---67360683565.pdf
    • http://xlsferrosilicon.com/d/files/jedarizuvidafutazamiso.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qpgil1i8cjvu84lgefe0d6rao3/woxolanesotisizabegogetij.pdf
    • http://alexandraharris.com/clients/36054/File/baxezexizipowe.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6226e8f9bb004be1443c5b255c483ea9/29869959762.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bhmb3gsjc25bu36g8t6jegu431/6053876176.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/8298927005e910c991b458b15d0500ff/4040311753.pdf
    • http://fedoro.ru/upload/file/rodajowi.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814e12629db---60058962234.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=erotic+stories+and+pics
    • 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_off00015435.bin
b6868d622bae5330da1f52a5ffa75028bc3f2463c0b0814c31ce6a3ca3ffc172
pdf-font-stream PDF embedded font (sfnt) at offset 0x15435 17388 bytes
font_01_sfnt_off000181a3.bin
7e969bc788b12784f9a13ab0e6b5cf37af42773b3a690f87d5f51195c28fc3c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x181A3 10444 bytes
font_02_sfnt_off00019973.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19973 16792 bytes