Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a43dd1c7587b92…

MALICIOUS

PDF

90.2 KB Created: 2021-09-01 12:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b91afcfc57bfd116dccd8a0b9cc83af SHA-1: 8736f9c56cfb8acc2f73b1d2f61177a13a205f68 SHA-256: 91a43dd1c7587b924421b61c44c0426805e8852bf220c1590bc22d34ac744339
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://swalaya.in/userfiles/file/mubav.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a78a391f0b---83171431621.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/40877358601.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e439a9f6af---lezivirevijuxutizape.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210827140431.pdfIn PDF document text
    • https://cmoretv.com/userfiles/nafotefumizipijimemem.pdfIn PDF document text
    • https://quangcaomattroi.com/uploads/news_file/mezotuweme.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/kujekofativaz.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/71573859985.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/38558343516.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/81302426912.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c72cb27733---2095787170.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/12788215736091b6200d4c8.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/kazaluwexoromig.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d471cd217a1---bupiwozixaxususexudok.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/67278208216.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8rg5f7pauf6ov2dfej7d49uoi6/fezetozufoxesosetopunexug.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/41164473676.pdfIn PDF document text
    • https://blokhol.com/upload/files/71713779923.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/tubukelosexakojonab.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/87360cb479c420bb76e6b693043d2e00/80821890746.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/biwepuvekuk.pdfIn PDF document text
    • https://roc.mn/uploads/files/29102553019.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090711c60b44---bepukemikafovozelesep.pdfIn PDF document text
    • http://torgoborud.org/images/file/81526612327.pdfIn PDF document text
    • https://anfauglir.com/images/file/puvovixotagilesiwazodafes.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jukamagafidabogefuze.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/bifidozamowijolavuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=thanks+to+you+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 22684 bytes
SHA-256: 7075af017d0260197dd45bb29fefacd07d298b9a039ccc35a50a7eeb2c8ac7de
font_01_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 10680 bytes
SHA-256: 6f909237c3e7c3eefb3ad8ca47fc419cb4fc75cc66165701d1e6507d536a10f4
font_04_sfnt_off000141a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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