Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf92ba1e3c7b39c…

MALICIOUS

PDF

75.6 KB Created: 2021-06-17 06:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bcc9e4cf545f66038729d9b7933ac760 SHA-1: 70d8ee485ad5810c9026fbb0cf6cb33bd9cf7634 SHA-256: 5bf92ba1e3c7b39ca2461f6a58789ed1f850507e832a728c565ea156714d167f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The document body, though partially corrupted, indicates a lure related to converting PDF to editable Word documents, a common pretext for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=convert+pdf+to+editable+word+free PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/fcta8ph3mijkaebqp6fikcueq3/88198098131.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/gobetodudukolegiviwar.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8bd77a730---77387278864.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/702e0fe4bfe148864ce2dc2c3580f667/baditimutelofizuvame.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mdfte7or4f04puv8nl9bj4d2q4/puboturotazikoxeni.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506033132439320.pdfIn PDF document text
    • http://gptools.net/userfiles/file/15786015601.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02611a0a7---29788104059.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/tuzok.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/17267523396.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/dapil.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f5d8fdc8ea0c92e2108349bdcf9a50f3/wepaforadurepaletav.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a625e056f0---28470280018.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/250725418755.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48004e824---lixuloma.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0fab29b9---toxomukur.pdfIn PDF document text
    • http://novichiha.ru/pic/file/rozuzufuperifetika.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 5056 bytes
SHA-256: 6c2a4e6ab04befed61a289859ca182667ffe6942c3dcbc3cee3f588ad07a0288
font_01_sfnt_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 6148 bytes
SHA-256: 0b38f6fd5e0b54bfa22d5adee1cfe00629fe134100fc7cfc1ad14a2ab7974207
font_02_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 10332 bytes
SHA-256: f3500444859da555d078e1130c02bb5adacf2e1f5927a6d7b6346e046e9fc583

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