Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d15335703bc882…

MALICIOUS

PDF

91.6 KB Created: 2021-06-28 20:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9b0be3193d10849c4702500e3aef8bf6 SHA-1: 58ed79779d2a57d75eedb62d061e8db0df2995b6 SHA-256: c1d15335703bc8822310fdff01077e5ccafea85cc1e59cd0d62bc8491108c866
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a likely attempt to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=song+written+by+suga PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727c56bf8d8---soxizur.pdfIn PDF document text
    • http://falerisztika.hu/tmp/12484576433.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/togelipitapogujas.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/35949434583.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a0b5eb3b---71838832620.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/labikono.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/donikevixezidudimodamu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/epghofv5li5bd2nmjp05jrpdvb/nabesoz.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b1609e3d6005299f7660a32b57e5e411/firatalewobiwifabe.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/1318585627.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22639da1533e1140737db3173e33c959/puzis.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9b228c6d5db528708355511f17dfdac7/jakimodukukoropusuzas.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bfeaded71.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/nudaduxopesapiw.pdfIn PDF document text
    • http://gptools.net/userfiles/file/63787685882.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b915ac029135fcf10b2e91797025f9ee/dokepori.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160873bd86beed---65347237264.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16073daa317a29---wonasomewinipaxajov.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/bj3ru5tmn97ig1kjpu0uthbp5g/gukerinefojipager.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/19861548062.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5a4a5f2fa---xetonabagijavex.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/38219992897.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_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 17792 bytes
SHA-256: dc3160001baede886b2733abc7dc45d84fc3546396e32454ada43edbccd87cbc
font_01_sfnt_off0001306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14882 10752 bytes
SHA-256: 948f928c14bd0b13ce3bd86b8436324d76381151543d931d92e6dad84fe59a5d

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