Malicious PDF — malware analysis report

Static analysis result for SHA-256 af57a7da9e3d6c46…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 08:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f97c2df9270b497d82bfb86a4c375979 SHA-1: 4daf3f3ffad42897608f2f535fc0965408a14594 SHA-256: af57a7da9e3d6c468fac8ff2c948f2cbca44810bb66c177c5d1c346342b68ca7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://ellev.fr/upload/files/ledibazatexevunifikine.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613452046f47a---15007183740.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/97356587186.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c282622663---57370639407.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/bukekoridilosadizizaga.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/44429324762.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/tixisudizufine.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/tutomexefakipolax.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/63529518192.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/64857589740.pdfIn PDF document text
    • http://vit-physio.de/file/vurizerimovip.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/63467937690.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/9484666797.pdfIn PDF document text
    • https://buka.ru/sadm_files/mobekovoraxefixesojodo.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/68803005372.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/03053936672.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109071525417749.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/jugibomepexuxuke.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/tugekulugekuvifukejel.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a95fc48fa1---liwotijudepanepajazabi.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/33736415581.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/nirurituxixoxibewej.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/9178106701.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/bisivuvexorolilat.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613beb99bbb52---81443462968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sending+resume+email+message+samplePDF 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_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 17084 bytes
SHA-256: 8c5c3e88b9a9e65f821a25e31c3e2b790904fb101a20c0d7efa19c7135902c05
font_02_sfnt_off00010cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFC 10692 bytes
SHA-256: 1cd394ad33b1ee7b69c46e00750d6cded0f9a035bbaefd145d90505b4e6c358d

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