Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d1313fa031458d…

MALICIOUS

PDF

119.9 KB Created: 2021-07-02 01:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1d937b3a3660c4dbf22cdb0834bf672 SHA-1: 141c4318c141d4c38b0a5a01880c52dae86dfb8e SHA-256: 38d1313fa031458de78a798d5c921b89799ae97a9411b8c5d5be70c0edd50886
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16071e6f4a40f2---94022693300.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/36d8c0d1f63796c13072e2fd872002bd/zaxakupumolewix.pdf
    • http://24cvety.ru/upload/files/58064696924.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9ddffd3580b0014fb928a2cf99f50f13/dumowiravezabokuluwobas.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b5fd4480---75320654379.pdf
    • https://tlproduct.com/userfiles/file/78426842727.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96bfe57f5---kovuxerelomovanonirob.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jbh7lp90rn00p87cnocbmhqjsg/86076844247.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8f0f11ee9---28480248292.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609719bb8029c---fepumese.pdf
    • http://apcmagon.com/userfiles/35529278330.pdf
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/vebirenilorod.pdf
    • https://mariellatriolo.it/public/file/19036737414.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c5b23fcc3---29687959709.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b49f83719---mifedemibikukav.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/56e6f23b85439fd33b3015c54db3759d/murevanevodoredibeseke.pdf
    • http://a-kamen.com/userfiles/file/24187176454.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/7b0318e0e87d9264d214ea6edbbb4270/bipetudidilalofe.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071500d35a26---tikasadopov.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/d5b16060973ea30ebbf8b9324d44dcb6/47000113065.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/97cb5faaeac266a2b7c746d60422d960/porefixanutivubudigod.pdf
    • http://caphegiabao.com/upload/fck/file/34524477609.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-18/20210518131651402420.pdf
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/17694524248.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gender+troubles+the+butches+watch
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f27.bin
2bccf8387b4091ac003738959847ca07f7c1b380e9888c8c985a4ebccd8ff81e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 10512 bytes
font_01_sfnt_off000150b8.bin
a3a94ac56bcaff62899eb5e99621ff9cc830c1850bb3886316264b3962df6d05
pdf-font-stream PDF embedded font (sfnt) at offset 0x150B8 17900 bytes
font_02_sfnt_off00016cbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBC 16792 bytes
font_03_sfnt_off000184d3.bin
f0964b8952a7ae8b2eed7f13dcf215a738e13ad889771d7c4b74a3fd950a9762
pdf-font-stream PDF embedded font (sfnt) at offset 0x184D3 10740 bytes
font_04_sfnt_off00019d8d.bin
da74331e18452d844de0eec40c99e68e8fcb7e399bf44c575ea0d85e208021d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x19D8D 22752 bytes