Malicious PDF — malware analysis report

Static analysis result for SHA-256 338df7c21b96279a…

MALICIOUS

PDF

117.6 KB Created: 2021-09-16 05:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2f3aba6b6869bff458610369d4f0c52 SHA-1: b8ccc35473d475217c46d215bdd9bcc1875c5a5d SHA-256: 338df7c21b96279a93855bca9346b133a69fd2116fc378995b8ccffdee933fc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF detected by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous external URIs and link farm heuristics indicates a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/uplcv?utm_term=batwoman+season+1+episode+9+online PDF link annotation
    • https://zerling.eu/nico/images/files/65109518612.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/22112435579.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/356554261.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/gegivonorosimewi.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/bakosuwitozava.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/95643147511.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/5621a0d6db90bb9b36d6d116908b0977.pdfIn PDF document text
    • https://hoongnau.com/upload/files/30992072903.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210911001726.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7e4bab3ifp4vu0s7udctskbld9/zalimowaxuxezikanuxi.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/januwapizugo.pdfIn PDF document text
    • http://armanetti.com/images/7218384399.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/nosevinemesuvotiribabu.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/warenewozonuvetipobi.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/48178938461.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/wokajoz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/abmuat4ub1nmabrg7703pb50b3/todiwel.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/11298699497.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/poxununa.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa355bacf---kodexutizokijumusi.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/96237279980.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/sodutupofagu.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_off00016479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16479 10812 bytes
SHA-256: ee36beeb99231b491f7537e462eab87b9e0c52e277cfe27a265d60138a00fdf8
font_01_sfnt_off00017d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000195a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195A2 19024 bytes
SHA-256: 31486207e721da79f046798fefabc313d559ebaf640c59dfefc5da71415c8154