Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8d1633f1ac8df6…

MALICIOUS

PDF

237.9 KB Created: 2021-06-14 15:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0f7f12b3a978c8a366be9e968e472b5a SHA-1: 953ea9c23f50ff13c45130ac3dd53c5b8e4fc8e1 SHA-256: df8d1633f1ac8df63e585d589288c416ad05ec74558aa8ddbdf94876a7d67c0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains numerous links to compromised WordPress upload directories, suggesting it's part of a campaign to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to "Nasus runes s10 top", directing users to a suspicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 5

  • 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.
  • 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=nasus+runes+s10+top PDF link annotation
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609600c766e79---pavutalurewobirizevapuwe.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffecce6151---jalemosasumebelavubo.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f38b882ca2---mudiku.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uqv8sogkg05qf8ia74fpndotk1/20771200873.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d456b30624---91552996067.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/zofilofisu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad77f9e90aa---wovumem.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/88119526717.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/samuwemomumat.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac154fa76---14976178349.pdfIn PDF document text
    • http://jaatkinson.com/userimages/latitunilujegamewajabavi.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160783648524f7---jotegi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f8d12e34dab36f4f5e65879162c1612a/sejokol.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b7fbdd3c4b9220bff2d8ecf3a352100a/70520882776.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6625702cf95a104e9c4b0e2fbd120697/donorojujipajum.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/ladimurewosoladoxi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f357180d---15592297316.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c5b495f2f---xasunafuzenagosav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00037347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37347 4944 bytes
SHA-256: 8b81811233173cd713cd95b22732e93b0eb70dc609b8806fcfb917c8423c7a93
font_01_sfnt_off0003842c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3842C 10488 bytes
SHA-256: c37707fd951a80e147c82ead098576d3518298e042986422bd5694edc7460fe5