Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e96999c46515b33…

MALICIOUS

PDF

79.1 KB Created: 2021-10-09 03:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5612ae705b40fe11d0b9894ff8ff4ce1 SHA-1: 13b790ce89ab80e029a87d82b5bcc530af808a03 SHA-256: 2e96999c46515b33b0ce9bd5b8d8ee0de74c0a97dd07b40e50d0b55540172441
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The presence of these links suggests the document is intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=washington+regional+outpatient+therapy PDF link annotation
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/q2nh464fm561qgr1jfqth23daa/veziwagezakasafewetafev.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/46653618409.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151614339050---68677617724.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615b8f51d48e3---81682227956.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/dosovosarago.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/jekurosedajiselupidan.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/gudemof.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/51650627032.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/43658286064.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/34601455851.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/gabifibuzelone.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/bijumafanimedesoburat.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/rofevejapog.pdfIn PDF document text
    • https://botroul.be/uploads/5235395442.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/45827327325.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/57776486447.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/penimedafib.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210903_222602.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/xotuwovobu.pdfIn PDF document text
    • https://dm288.com/slicice/file/pagikuvajudetodono.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/32251700656.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/40116093172.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/fesokekosuwituwasegamo.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/zozumifap.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161558dfd2bbf7---29151013939.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_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 18492 bytes
SHA-256: 2ee2d429a0edd603e102d8d51c683b71096dfdac0319924486974482f9a700dd
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 10736 bytes
SHA-256: 3e2052365411907c71a5888d22d59cca5784b4107f780da03378523ef20b2897
font_02_sfnt_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1