Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1eac8f053a2103…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 02:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 118a30f2d72bf18dd902f1021df5d351 SHA-1: 3c4319de1926537dab909afb8144c4ade8718bcd SHA-256: 8d1eac8f053a210304a2de3c80b8ba877e1312ec58ffbeb20af486060560b572
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The primary attack pattern observed is the use of a link farm within a PDF document to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://rajhansnursery.com/userfiles/file/situwalepegus.pdf In PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/jinefevokagepedobesapi.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/96790642920.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/85266914211.pdfIn PDF document text
    • http://renovator.cz/files/file/26273224576.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da601324d18---jefepilevuwa.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/japejabe.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/47cad14f06dd88131c6988484e56c702/3713218572.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17ad806ab---69257809643.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ee372e91344---90806377480.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vapawererufatiduranomix.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/goresa.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/8icev7n4as7nc9nnkvg8lqla39/84095200760.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kixeraxenuputa.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/36273491700.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/53517394363.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889d32e414c---28583930682.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a874bf48655---88222684883.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kokusodenanotenemem.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/lamoxezobevob.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/giecgusr9k9tc22b3tenscpjrb/24356667902.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3feb35197c---posejozawad.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/34176916348.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/pidom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=desarrollo+humano+integral+9+pdfPDF 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_off0000c7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 11216 bytes
SHA-256: ce49cd464ce9cb2401ec1e8121519d6d72df814e4f8787b47fe3848b781f08c1
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 17872 bytes
SHA-256: 956090d2ff3dde03d3148d522aa06e3ea906f49c60b8763f6562025c3b065e48