Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4ad89eacf96e37…

MALICIOUS

PDF

88.6 KB Created: 2021-08-08 17:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc25cdd9de82f4695792ec32138f8b66 SHA-1: df348ca42c2a80f94a7a46a9350d326fe61488a9 SHA-256: 7d4ad89eacf96e3771fd333b2126def1fa8c283d1cbbf9c2472287f8c7a88457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm hosted on compromised WordPress sites, suggesting it is used to distribute malicious content or lead users to phishing pages. The presence of multiple external URIs and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=can+chiari+cause+seizures PDF link annotation
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/uk246osr4d7v42mqauf1gllg79/43827109300.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160989c5b51012---2770283308.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/51538367133.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/uqm7j3nd4kn4v3k5vqsge3meg6/kiwijipejazelilobad.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/42913034710.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xozif.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/mitiviwidilop.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/tekenisivajaraviluwebimo.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/xinobezejigifid.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c26e4a8a579---80605473902.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/15985032450.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/gapac9fsnnspvn6p8othrseiac/92595780004.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/nifewapebenaxolisiwivavur.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/rorozumopizamafufeb.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/vuvaxak.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa69c4277ed---tosuj.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef030edb8---78491327640.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/devasilekel.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/17221032055.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609122a15c4aa---80209845618.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/313092655c4dc62dfb445689d30e4b14/67876802541.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/176a29cba8b24014cd8a2a2d3e4b519b/95480227146.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_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A6 16308 bytes
SHA-256: 2ad5454bc7f5a6fc4ef6ea63de8dabf2d733051e76560816ecb006f11b1ac7a2
font_02_sfnt_off00013cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 10252 bytes
SHA-256: e0ebc3fd79c7b9c9bc0485f20bddf61b910e6fc494340513ae41700def934f1b

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