Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4eff143857e54e…

MALICIOUS

PDF

109.7 KB Created: 2021-07-03 02:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 28e2e6e6cdf5be93a65adc682bcbb0e3 SHA-1: f73f8ab0093cc10ea7693fddf0ffec7b7bd5ae2d SHA-256: db4eff143857e54eb9d061e4dff6cb3e903c2226195b3d1e76dcc515aeefae81
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute phishing content or further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ketchas.ru/uplcv?utm_term=franchise+terms+and+conditions+sample PDF link annotation
    • http://solar-makernavi.com/ckfinder/userfiles/files/vilepidexizovulavizikekan.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/9e04a64b9b133cdb4a4d565652da0f72/91922954122.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/xibojewaduzipozojibe.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/rifuzosodokupagezeko.pdfIn PDF document text
    • http://nakatka.com/files/file/54767170285.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/do0fd3o7d9pe47obhjqm45jvas/54268114705.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afcffce4f27---veranapewutela.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/19437773883.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/57820753307.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8925e6ec7---80042627139.pdfIn PDF document text
    • https://led7.ru/file/87072232997.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/fixiva.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/girusevixelamikifu.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/vatejutikemovere.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/wonukaze.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd04f567284---zimotexipexarumivadi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/84133a73d724e72d97c2f88f6b08dbe3/8231113522.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/62595845408.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/89867203260.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/30384531607.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de0384267---laxutupix.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7d69857c---40959450597.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be1bde6dd9f---suxezededeto.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/sevunometebusexodezonijil.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/lefimewiwixawuti.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_off00014c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9F 17060 bytes
SHA-256: beb6232487ee926fa28c2e9d71c9e86bf7666c9204c4722d8731249e70ad2b88
font_01_sfnt_off000178f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F1 10756 bytes
SHA-256: ad8b80b6936e8cc68757d12ca0be2b8127750c10bdfa8e89a9c38cbef814a875
font_02_sfnt_off0001916c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1916C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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