Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ae35af8c5f4a19…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 13:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1ab8556726e58ae63058ba91e805dcf8 SHA-1: 554f1721e0d8610d5a6ab24f5bf1b7bd6221ef3e SHA-256: e0ae35af8c5f4a193d68b05ccd5bb121b75748ad766f636f857fff143287b693
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure suggests a link farm designed to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=little+red+riding+hood+pdf+scholastic PDF link annotation
    • http://forter.vn/hinhanh/file/5977938760.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/8d0e4a7784c97c7915dc271a0f798a5c.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/89d37ef923335dc402050842d1168b24/20199064115.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/20171553554.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0leod76r3bol0vr9o9bs7mp7v/magubaluve.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136640b394a6---40264648688.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/18925497496.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd82ad5df---81817882253.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767e322463f---42494911824.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/h0l0m0gf19qs1aeslsjgip3ste/xogugulolevisiveba.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45678d3ec---vewujeledagavusowasi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/50485303291.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608317240f570---mezepu.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/duzevobinaxomafaf.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/58139330979.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/bca07eb7c780fcdc5fe8e5c40125314d/30900150591.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fe06770a28b97890465ff59bb5d35b75/44218988111.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/sirotuwav.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/33585651416.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/xalixuxofavebalo.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/fizamigebekuvoxarosugusuf.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/4595035884.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/joluxenebuvuvovajawa.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/dedf1cb525e12a32703c84757a1ef6e2/buwibifuja.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_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 10856 bytes
SHA-256: 2dc8c96b89d50c449a62f055fe6365019c0d7e34acda41b2290a325cf2a52e25
font_02_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 20508 bytes
SHA-256: eb7d90d7e007b1dda65fb45ebcf495275c1fde7a4a025632ef2d52d390535862

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