Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80bbd57ac20e577…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 00:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45aec42b8f1d0e6de2907f04054c903e SHA-1: c9320982ab1b4dae2b31e733a949118bb85d641e SHA-256: f80bbd57ac20e577ca640aa1015577b26582fc9df78a2bf0ad03f7a2a1cbbafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to other PDF files hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://krisoc.ru/uplcv?utm_term=bluetooth+tutorial+in+android PDF link annotation
    • http://cecev.com/stockages/files/soluwofofiki.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/985744f85bed9cccb7bfdc7acfa90bfc/nujipawala.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/femoror.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/73816798995.pdfIn PDF document text
    • http://popmetre.com/news/files/45006449712.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/zexeximoridopisox.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/woruzapoduwirasiremoju.pdfIn PDF document text
    • http://orem.mn/uploads/files/texag.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/kidebotilese.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/pixaro.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2ac2ccbc329777a7da394aa3aea12a1b/mibutujowaxuwut.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210919_6BA460FC216B833D.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/25101382124.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/nupuzojaweragibegu.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/maxinufigemijaj.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/28031547608.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/80424338177.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163174643799529623006.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/rovipesimox.pdfIn PDF document text
    • http://gaudi.tw/upload/file/nagonezuxevixojeg.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614b25cc509bc---kivir.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/talofapovubad.pdfIn PDF document text
    • https://ip-pharma.net/data/files/wesiwasowofuwudij.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/gekakezoxawikatabisak.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/xizojusoretagi.pdfIn PDF document text
    • http://industra.sk/userfiles/file/mubotelijudovemapetevav.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/8kn3i7c4rokj6pirl29l5bfa0o/godoxawite.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_off0000b386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB386 10332 bytes
SHA-256: 3fc35ddcd049e52d4fe3ff672c2b6934a6090df02d9b5c0b410b00c123875c8e
font_01_sfnt_off0000cabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 17332 bytes
SHA-256: 549fc87adcd5f3e62e33c3d3668e3826c74151311487bdbefc5001d9c7ba642c

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