Malicious PDF — malware analysis report

Static analysis result for SHA-256 278bae3ea94aa7b7…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 05:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14f9073d029a61d9b87f3194e54dea1d SHA-1: d49a7830ef09904f8bac680da7cf9ad84afa94c7 SHA-256: 278bae3ea94aa7b7997a62ef28cae066549b5cc8e6326499029e25efacaaac1c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing pages or download further malware. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings indicate a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

Heuristics 5

  • 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
  • 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://vieclamlaocai.vn/webroot/img/files/luzufarukikor.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097f56eaf035---joniminuw.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f20ac9f14---luvoz.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/xetefetisegixewuzoxutas.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/51627502809.pdfIn PDF document text
    • http://stevis.cz/files/file/xativarorubukawev.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/59b32a8eeb416df8f4258510d66206d4/88948083605.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf8d5598f---55003868777.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/dopabifivekaw.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/96588718356.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/jewinusowiwozivaxo.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/dapezeloso.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b998b7156e---funoxerixukul.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/a1224699ad6ac227069f928415fa56d8/10538276313.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c26c8080c27---29447715498.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/1e001fd2344df8a4dbc4aff2644ac3c2/napimewedamapufifif.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/gisimivabojomi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf37e518f5---dogapakifeg.pdfIn PDF document text
    • http://irths.com/upload_files/files/jomowiwupefebumawezibi.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1626880708.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/21459182578.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/86826068963.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/vegasatukinotan.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b05a0d40e26---17343293610.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/wujibolofetusabozunubew.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/xibuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=diagnostic+manual+for+infancy+and+early+childhoodPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 11140 bytes
SHA-256: ce5363fe214236d1a47e9b8144ba8f32b66388a926223240b5ccb69077b223ca
font_01_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 19192 bytes
SHA-256: 2c8f5b6e3e7e9c412c4ca2af9ff0f2a98624e1183e863ca1865b6d5739767479