Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b8f066c233959b…

MALICIOUS

PDF

93.0 KB Created: 2021-07-30 15:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0739dc7095461a284ca39ff6046bac1b SHA-1: 5f245e5ef0461f65e5d182a1f97bbbe8737da57b SHA-256: 18b8f066c233959be2dc120eb845558f99981a75ec4a6b3892b4df4b466965c5
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to host or redirect to malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware. No scripts were extracted, but the structure and URL findings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713f87ace59---30887872074.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a705959a230---98678664162.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/83918903844.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7234454efc---42894588623.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/tidulu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ded028417---milabubipod.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087656b6428e---lebadalisogasufubogas.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/10325851619.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100f77f9afbf---20036434578.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/7317642717.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pmn8pq2liijmtdkops1koh07e1/54010099621.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/93s0mf4fh39oga8mn09oattu7t/nipisajobus.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/j0l0rp2qbvami6kj16es3thv7l/sitirurusuxawefukujuza.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2346265173.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf7471ce83---zirubijusigajajogozix.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/ruranejukixu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8cc8daa6d---wemofadozarozabod.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/42410060480.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc98f8e43a---40310044308.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadbd4951---46953178321.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/61a1b5271ae4f6768f3836b6d9c6bf9f/80643048083.pdfIn PDF document text
    • https://menu2uplus.com/images/file/wobuvewigatuvobujasej.pdfIn PDF document text
    • http://ezstreetautosales.com/clients/876244/File/56343395318.pdfIn PDF document text
    • http://soles2walk.cz/data/file/12208325251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bootloader+unlock+apk+no+rootPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_01_sfnt_off000103fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 18240 bytes
SHA-256: 7e960e47b9c3ca2c9058fa9934509e4297406c0d0f0c50bc58ba7a507a0fea51
font_02_sfnt_off000133b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC9 10492 bytes
SHA-256: e54fea3a4be1bf1e8ea7ef42a5f1494d3030c23ad995231d7aaf63cb353b5498