Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd391371ab508b5…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 05:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 84f38e00466670b00b0ea1367ef064a4 SHA-1: bc561981a1fb959352b93c823aabdc045bae14fd SHA-256: 8fd391371ab508b546ce8eb5bf951501cfd1b5a6a671e6ac549341949f4e6fd1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/54905d8c3d695dc9e62f0e622586b5e3/gerovidegaramosutomewe.pdf In PDF document text
    • https://weddingitaly.jp/images/file/valinabopadabix.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca550e6d92---41194231100.pdfIn PDF document text
    • https://migger.dk/userimages/file/rerobepujomamegol.pdfIn PDF document text
    • https://pindimana.in/uploads/file/mukewurugevirovemeji.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/521622fd363d5748adfe88460ef2598e/nimowusaguvunurob.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/gumonijuxurikura.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b6843d4d9---kusujemiwiwal.pdfIn PDF document text
    • http://cortabellanews.com/userimages/zaribevilupofulafomenamav.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b3d57bae1e41b36264fda91baa4a7239/50162081879.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/monobizigezenixa.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/baxikop.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/85463090186.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/wejizifew.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/985bed98658b2e0781f481947a6bdaad/92747414836.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/goxog.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d97de1553---vuvego.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d46c9dae---pomedizurazulojonug.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/14802512074.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6cd97772f---gawegapelojasumat.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/55203733646.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/religoboge.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/353914b278e3809e70116daf7939dc6c/21487201228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=electron+configuration+1+to+30+elementsPDF 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_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 17576 bytes
SHA-256: 26f877a647db0dda2486ab82e562f63d0af044f59e5e40ebc7fa8e71840a2713
font_01_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325A 11108 bytes
SHA-256: 0d1aa1697cd863f125a96bd605b02abeabac8cebe36e79f84ba3d52da4fb3913