Malicious PDF — malware analysis report

Static analysis result for SHA-256 86080f5d0e7af4cd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-24 20:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43c2cc57fc3e59bbff14558390ccba96 SHA-1: b27fe711d8b7d84e4465a4defe24b5b96eb072b5 SHA-256: 86080f5d0e7af4cdc366a2727b50d43e02f559e2dbf615d3730ea4ac3fdba928
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress upload directories, indicating a potential distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://goldenstarhotel.vn/images/uploads/files/88206799292.pdf In PDF document text
    • https://ud-hobby.com/images/Upload/file/nunig.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/fagoragefamamuj.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/difugugepis.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/70731576516.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/zaruravav.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sodunaduxegugewaladi.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/tisejogem.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/66569312539.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/witej.pdfIn PDF document text
    • https://proxus.nl/file/89311345039.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kexuf.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/740kvd71pu3errj3d100r6rju4/71128699106.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/93283113873.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613111a9d6247---34149910430.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/fafatato.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/3478579129.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/wategivawegemibop.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/xewewidedo.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/23570909952.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/kexivef.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614298e5c14f9---73255299368.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f194561dde---masebovuzaz.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/xubabisaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mandarin+is+language+of+which+countryPDF 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_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 11048 bytes
SHA-256: 9cd07b729ad2a1bb087dd932847e433dd06ccbe3c34cb9095e6fc2df4c5a7d0a
font_02_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 14636 bytes
SHA-256: ef8c2a43c0235342d4212ff7af67b1e66b8d310cfec842c6d9b229b61f9fcf13