Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aad0eb3a70cbfc8…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 13:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8276bbfd5b803817092bdca77f4db7e1 SHA-1: 28b2c966cf1b492fc7ac19b7d1f55e53e7c05684 SHA-256: 5aad0eb3a70cbfc83fe77d4d44c8def560f98074815e68f59d562efbfc05ee01
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with 31 URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and compromised CMS upload links indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pistant.ru/uplcv?utm_term=between+compound+and+mixture PDF link annotation
    • http://cu-hinothai.com/ckfinder/userfiles/files/gamagavebu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/3549130479.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/84989469113.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/95387613764.pdfIn PDF document text
    • https://sadex.pl/fck/file/jufedow.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/d6uo7dl4o4gi9tiu6ni2j9u924/18778314122.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/00c287d22b8a28b302e6f009e96a39f4/36708950524.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d36ceb8f596---99568261730.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/a37f0f3153e954d2c3470bdccb17b6e5/98482719473.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806f6770027---90689809810.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/32615109427.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/57b3bac782c49c645843582f803fbc3a/53230034074.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/e49b1d9451968b7116b51a2ebefd1560/64470196678.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/gunudadotimivodut.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/tomawaw.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/zonerigufelibike.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/76890150985.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/gamugilezavubakinobazujax.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d581a64ef9---xotozusoje.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2d53cb3fcdb09ec9a245caa175570a05/rodatol.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/lunumorubi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0de63c8110---midejitowaf.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_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 10800 bytes
SHA-256: 63c25fe129ecf9f6fc5345d1dab930377a6f1c90bfbf4d95a19e04df6a6c6c42
font_01_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 17388 bytes
SHA-256: 7446947721d265c46d137ccbf349112c5ff4279a15f6b71cae0a179adc26dbca
font_02_sfnt_off00011ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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