Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5d6586fe39f1ca…

MALICIOUS

PDF

88.1 KB Created: 2021-09-20 15:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86982f1b7b3c1264d3ad6e191b68aac9 SHA-1: b7aebcd3dded530b34cbd0abbe1699bbcc50405b SHA-256: cb5d6586fe39f1caa2eaf293fade58af0fb29858abc903d33e2dd58623401d5d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://cybernet.asia/UserFiles/File/gefafewusadimitojojetem.pdf In PDF document text
    • http://mosjob.ru/images/file/funisujurikotefe.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/18851977588.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/82806956204.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/susogujujajibuwavibov.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210918022450.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tubumigejavid.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/um09s50mvkhlqvd6u407hpo4h9/soxawanebapagufoforude.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/74562130302.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/sonugeva.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/10637562523.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/wugipifik.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/98736595150.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/gipasowakabusatiwow.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/92541138641.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534a22d7da---76160443862.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/37972307327.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/mewopexax.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/46703774882.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a74ec59950c9b7156d71177faa24f367/2942537426.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xozado.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xelez.pdfIn PDF document text
    • http://videocycling.info/files/file/52933912841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=antiderivative+of+quotientPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 10424 bytes
SHA-256: eeb107951b86aee9e66d44fa547f2938a3e9c1de6313b5c6b676b6d85b673a65
font_02_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 16208 bytes
SHA-256: d2de3c28bbf72132915eab0aa829c4d70e03f8d80d264e8f5d487c05dcd420d0
font_03_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 20640 bytes
SHA-256: 166458ea60b93a2df0dc8920d254ea8f5313d1d52501100dd317f0ebc4e0c2c3

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