Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1882f066e70cb3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 11:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c973a63d38bfea9e36b19056b6d2803 SHA-1: a71cd25ff7e95c9497b3ac315ed38c28d4e1a489 SHA-256: 6f1882f066e70cb34693ed8ecaee8a4074939143bc0135195d67a3f920b9a23d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=only+fans+online+hack PDF link annotation
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/99a3659903d8ab2ba57f5bcd0ef67364/bebaxufo.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/zewuzewadafajipufig.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/gezakexixemomaxuwifej.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20af818ce---61177940883.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/moxad.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/16561164146.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/kononubenigegup.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d835aaa168---potowokuxop.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59be0017a---2566820587.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/tovugusobega.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/36387018264.pdfIn PDF document text
    • http://arucax.am/user_images/file/14788159701.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/60556752379.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/63525119183.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/nidifexololofekiwitobumag.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/rixoxul.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614165c9c2a7b---kuwon.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/ruligigif.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/26275570080.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/27290954160.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/19951441902.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/gotebirukemo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa2d2c5ca6---xijadowelexakolavufato.pdfIn PDF document text
    • http://grabnerestriche.at/guwaz.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/duxusi.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_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 10464 bytes
SHA-256: 37267ae7a5204be600b2cff72ec82d8fc4c56d050390dfe67ffd82369ab3b0e6
font_02_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 18444 bytes
SHA-256: c7dc77bf5cbc899b3ce6fd2c3ac35b77591a6508b18f4a8e0e1e65b2fd1f0fb9

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