Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72ae93faa0cfc37…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 22:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5d2c1aa756ae7ff3df4503ffeca87c8 SHA-1: 109f6ad1b707c66c508ca3558afc0b9d691dbe98 SHA-256: c72ae93faa0cfc374f0a264096356b2588ddf8bde812beddf6fb8b6ae70a2ae0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms strongly supports a phishing attack pattern, likely aimed at tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=rollback+android+update+samsung PDF link annotation
    • http://gtlitalia.com/userfiles/files/sunukikatolakafegateko.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/62775241402.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/mejezizozuk.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161462e64db129---mejip.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/18009758720.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/68881069539.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/fisevojuvixopixabarejug.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a08526f621---5333209690.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/563b4dc92b2f83eb6f46dedcba28a55c/49424248254.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/76212619523.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/52681540905.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/65348101916.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/19941433949.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/jigusoximovolijotikofigox.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/foperofade.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwopufunu.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/jufovobenuxudazozojew.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134865666a52---46874817446.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/19722193185.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/7849330349.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/10523384272.pdfIn PDF document text
    • http://hbaoge.com/upload/files/tolujexopukopilewezijij.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/zegoxetiwezokabivomer.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/kadas.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_off0000d040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 16488 bytes
SHA-256: 5e13c06b2f7bd10909e70fdc05dbdcbd115726c2ec26b2171ffb0c6367460143
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 11236 bytes
SHA-256: c644889fb7b3be386e3ab88b1a2d7ca0da3e50f1dbe8006128874fd1a1d552c8

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