Malicious PDF — malware analysis report

Static analysis result for SHA-256 552f18e75256eefe…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 17:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5e65da7f16f0cec5de8c416908c449a SHA-1: ee92f3b25fc571a14fe3394d2360254d5eb9b3e1 SHA-256: 552f18e75256eefe245f81cb71244dd54f558f4c552a76d9ca3ec315d8983ba4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=dragon+ball+super+tag+team+ppsspp PDF link annotation
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/podipalevanapepemir.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/d4d88610d7f8cf1a3d4df6f81a034539/93008093629.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/96167436910.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/80674077742.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/numedosufufunelazukovi.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/mopomovo.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/levaberelimif.pdfIn PDF document text
    • http://szjg.hu/images/file/rowenemesazesuvutogalibi.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/18713222895.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/66c61c257e593d94801c12ddc0ec2260/84826169483.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96644486539.pdfIn PDF document text
    • http://24cvety.ru/upload/files/sabisu.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/vokosidoji.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/wofet.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613319b1dbac0---gopobutisakidesisomividu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb78142601---38745639874.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xovovenabuxadipa.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/kinivuxezikonab.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af892052a---76603843826.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/92132579415.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/91477350745.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/40589316357.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_off0000cf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 10744 bytes
SHA-256: a0f9acbaef9346ed3bbc826f755daccf00190efcf0c820be89f848dfcd66fcf8
font_02_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 19808 bytes
SHA-256: c1085e70c66a13b80babd8dda24af217d7cd91d4905570bda22ee18afeada9e1

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