Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4274c73a89cf9c5…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 21:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c58b496145cc1608acb650c598adb15 SHA-1: 80a7ccd72a9aad9a13d53a50356b00dcc6c589ea SHA-256: c4274c73a89cf9c584f87aeab5abb5aefd655ed2ef04dc0f2d83b2a1893a0f95
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript and numerous URLs pointing to potentially compromised or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for SEO poisoning or to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bepxuyenviet.com/upload/files/vavepez.pdf In PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/58642381569.pdfIn PDF document text
    • http://poorclarescork.ie/images/48646995453.pdfIn PDF document text
    • http://tochalco.com/uploads/files/tifukovowufazovuro.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/toder.pdfIn PDF document text
    • http://koddous.com/userfiles/file/67225378704.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/5047467544.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359787aebf0---8334770199.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/matavutat.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355b473f3fb---73777003694.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/senuneboxosizorefina.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/23593689634.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/89864241867.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/28101953986.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/dovivoxemasu.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/53811150055.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/91687438719.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/mubofatuzagadanezomanuvaj.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630475765.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/gurenagikaxoguriromalo.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/fifiniviwe.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa6245ebd7---fidazesupudipum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=el+anillo+es+para+siempre+libro+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 10684 bytes
SHA-256: 116e8cfe80470ac7aa0960ddbea011b8c4903e5707c934498100f4a5f4ca91da
font_02_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 19340 bytes
SHA-256: 061d29d5217d81c1e7fad40c04cff396ad04da216220457dd0d88e3a316f3bb1

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