Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ff9d9954eef6a6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 19:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3afb94641efe4e5a370edbcdd8d62554 SHA-1: 285663eae9cf58344ec5d216e9a4088100d920bf SHA-256: 09ff9d9954eef6a661e63dff1165dfce064285fc4035d4af7ca013a7f25d8cd1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The presence of compromised CMS upload links and disposable hosting further indicates a malicious intent to distribute or host 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://coretry.ru/uplcv?utm_term=hello+app+android+apk PDF link annotation
    • http://1-cities.com/blog_images/blog_/file/79352939515.pdfIn PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/jogasexitavekilusiwas.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/nexixurazinevilatumibanob.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613999c2a7a54---kotanasite.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/tuxaridagevotufurapibez.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/finarejub.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/85ulmu4ud404i2m7afidlbei8h/kaguzo.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/mufaru.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99b10775c---13685724678.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/46078887210.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/94315118789.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/xipipokiti.pdfIn PDF document text
    • http://findusafranchise.com/files/files/rinurizuxu.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/zonivipodijakifos.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/56538308624.pdfIn PDF document text
    • https://blugarden.eu/file/66378337407.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/o05sodd271j41b44ripju0g872/zegenidure.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/javezoketutufupapanu.pdfIn PDF document text
    • http://sswjeans.com/files/vufidad.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/futegifaga.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/252545618613ef5274f02b.pdfIn PDF document text
    • http://chinahongji.com/d/files/75989667086.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/gilanegovejiwufegikipek.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/17411224271.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/vuluxibozaratumarax.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_off0000b313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 10200 bytes
SHA-256: 55cde1d86d44b727c5262f5dc91285552f94cac6fcf75f299624bace01f8951d
font_02_sfnt_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 15324 bytes
SHA-256: ccf3a8e6d891cf1a6f12f35a473444c75077a994d19e7127df26418d308e2fc9