Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe3ae8a3e3f8729…

MALICIOUS

PDF

87.3 KB Created: 2021-08-23 15:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a7a59a7533966bf4c22a27cf2553c0f2 SHA-1: ccbe856a126c42dccca90d12e588f6cae4b86cd6 SHA-256: efe3ae8a3e3f8729e998e453d9c3ef2ead387baff30e78beda0ee013a9468f3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://bodegaadrover.com/userfiles//imagenes/bozupojevenumi.pdf In PDF document text
    • http://nw-line.ru/generic/uploaded/44174246916.pdfIn PDF document text
    • http://mvhs1964.com/clients/2/20/2030ff4f331b14c2016b95997514b7ac/File/71568653523.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dedd55c7a---nikominewekumijebinedug.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/41207703389.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/46198957613.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b85795b07---soxum.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/995a5e56bab0dbf06fa2a913a673e891/53781402371.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062909441480554.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/pogijolunowikivorebapa.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/38353101502.pdfIn PDF document text
    • http://ssp.by/var/upload/87027884947.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7e36ecd38---94191000227.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/51422860450.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a0a3c2019434b50c4dd8114023b099c7/99738026744.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/17299348884.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a884ca0ab85---duriwivamivoxelobulupu.pdfIn PDF document text
    • https://isosklo.cz./uploads/8103071875.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/nafulugixasuvawawoj.pdfIn PDF document text
    • http://cwesp.biz/upload/file/depidado.pdfIn PDF document text
    • https://mauspro.net/upload/files/94569619936.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/loxokupidikoxoluwot.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77a942f93f---jevumixukebumozewe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/fdc3ceb1b65c47596598459332e1a218/voladagawusedusuwowov.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c205118cfa9---ruropovexoginomezelawufob.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080839688f39---79774251953.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66442cbc9---rusemadojageka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=time+is+of+the+essence+clause+examplePDF 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_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 17344 bytes
SHA-256: 52af41e862630a7e670fab927b6fac7d5dc0269d8812f1f8cffefbbb48db7c7d
font_01_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 10812 bytes
SHA-256: 7f9975a2c658f7432aee5d73cd138a6dd6e353e99615d3dfb34736fc23be49a4
font_02_sfnt_off000134a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1