Malicious PDF — malware analysis report

Static analysis result for SHA-256 59591f975b631cd2…

MALICIOUS

PDF

89.2 KB Created: 2021-07-12 22:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a6259ba1b705b76f0f1068586bdfbaf SHA-1: be3cc945fc6c897781dc47cfa9b8b2c073566006 SHA-256: 59591f975b631cd2a38c9dabf958f612b31f997a04447878f278ff8cd1aa0959
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=you+know+all
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/df081a5da49ceb41352388c608108a07/lesivatul.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/jloh6juh3mtcnckcknavhmgdvd/72868957428.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210513044003140126we1eo3.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6251b748f3---pajewag.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/3833733379.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/lkl6rb8c4g502ltn78om7ajnq5/30002872112.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088736e63c0d---87518862416.pdf
    • http://alliance-vietnam.com/upload/files/53357718003.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35ddce1c7---fuxosalibos.pdf
    • http://24cvety.ru/upload/files/56399808928.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d4807e569f8a134a715a43f569d6ef87/jinowadivefewamebize.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210528_92B3C4B9C60351D2.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05921b49b2---madukijuvunusujidewezir.pdf
    • http://classicalgardenstatues.com/uplds/file/77769655481.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9ujk54lb3of07uadvrik9fttjc/63218044514.pdf
    • http://fouladsazanco.com/Upload/file/20571697768.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/cekgflncdsf2bqp7o4oqaqk6i1/85507510123.pdf
    • http://asiadomainstore.com/userfiles/file/gukilipazeme.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/85bfc68eb1f99710a3e5361893f9ab38/mewizor.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/st42gneab9vev5ge16umdulfu5/xuragexivajawotawalifanog.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c10f9d92b---46429510405.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160825695cb6c4---92354035861.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc4cd29cc---fenona.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c90c535e9---mavikajisamurogilofid.pdf
    • 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_off0000f60b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 16792 bytes
font_01_sfnt_off00010e1d.bin
7b970e28555bab008cc31ba47cc838d62b6e6c5b7608dac648c7fe0d1c29bf0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 20100 bytes
font_02_sfnt_off0001409d.bin
19c4df2ae357feacdf9346be728c26caf202c11c98902d00f7fd441d00e3ad4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1409D 9772 bytes