Malicious PDF — malware analysis report

Static analysis result for SHA-256 0154886c4e708442…

MALICIOUS

PDF

154.7 KB Created: 2021-07-05 19:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 738578089e1125760832c48bbb12e5f1 SHA-1: c15deaa1c02b8bc3df97e44237dd139023d2dd87 SHA-256: 0154886c4e708442e04eb38d44d183e0b1b902da84a33d5b0dd47138a4602bd0
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan. The primary goal appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/96c60a30b3f88b3b982528ff263aca59/luvunopukixupadipegilima.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/aiat925icfvr4fb8jbb0slbsg8/mewibuze.pdfIn PDF document text
    • https://lecapsuledigian.it/file/sulawawanefujal.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2vca4a49gv7dbp2ok3fgfj8d6n/56491284924.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/69f341c1a11590750e629ddc64c8d0e8/kevivevefoj.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb407da947---xetevulotupasejemejawobux.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/475b4397143679c0e79352de23cd31a1/wijesuserojevine.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f5f4ba35f2377631847a0685f782a628/46478231944.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/lerixumibeso.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacf2256e4---tibirun.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/kosivorajotinutad.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1324182b32---xuwokutarogexekidu.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/78050859008.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/384f709987cef9469a07d093872a7509/xifozifisujoxidoxuwi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/58961537197.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/16076105890.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c6684762---30233906858.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/36719238039.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ck6juhv5oehngn08btogs7uts0/70945278961.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/812684cd3f1cf1c0594810c9e7517830/49067140781.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/betimokipezoxunemekufi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5142a9ad---wepapo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/45599224439.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/lekeijc2bcbnvdppk050gb8od6/filukijusud.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/e42vlvg458npoqte0kp1tilqal/goxugop.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8302e7eb5f441d88c3341482084fbe2e/ralusezogavebikevogadur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=take+up+inPDF link annotation
    • 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_off0001fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCA0 9868 bytes
SHA-256: c337dd9554aff14d3d79f0df9f041f1bdf2ca138c1726c700d404e0a40b588ed
font_01_sfnt_off0002126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2126A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00022a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22A7C 19484 bytes
SHA-256: 92e60989c69853a7ddf0a8d85b98275fc49f319e376460525537356932935710

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