Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f5e32a04373946…

MALICIOUS

PDF

86.6 KB Created: 2021-09-21 06:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 173b5cf30f936c8d210707d84a0d9370 SHA-1: cb34c2727f272231eca97010afd040b88226cd71 SHA-256: d6f5e32a043739460bbfb5714619d07091bfd76ada9c2652f79c18bacda79668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate that the PDF is designed as a link farm on disposable hosting, with URLs often containing UTM parameters suggesting a phishing or SEO manipulation intent. The ML classifier and ClamAV detection strongly suggest malicious content, likely aimed at redirecting users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=a+paranoid+personality+disorder PDF link annotation
    • https://haidangpc.com/contents/files/9151895684.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/62726333054.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec5ed47274---64748616565.pdfIn PDF document text
    • https://xuongkhopbadinh.vn/images/files/xirefodirafeloxaxemowele.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139cdcb6683b---25191795994.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/72021275673.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/kenozuwi.pdfIn PDF document text
    • https://podimercrm.com/img/files/47687676115.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/1425308995.pdfIn PDF document text
    • http://otoform.com/upload/ckfinder/files/fikizavomitosagu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142789640085---lirarozevep.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/94830422035.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/49291496886.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/86707694.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/22347938882.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/zokusunabi.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/zixaguvop.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/vatixanogakasifatolowajo.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/44393659326.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/lefuw.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/valetudoxemajev.pdfIn PDF document text
    • https://synersys.fr/contenu/file/dapipajixolodiwivif.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/zigop.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/vupitojezuwaj.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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 18708 bytes
SHA-256: 57422a92535bf8892ada2a2a74b95cbd7081a9ce1cc847187224f2a6eb474b95
font_02_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 10480 bytes
SHA-256: ff842c5b6e6ce8965d33e1a13ecc9798daa4e43d05760666a2533ca0871acef5

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