Malicious PDF — malware analysis report

Static analysis result for SHA-256 32877b1806a82466…

MALICIOUS

PDF

87.0 KB Created: 2021-08-08 02:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3ba1933c2ebc71d6aa64ec414a4b362a SHA-1: 2d50600468139f8bbaa5451adb0bb812bd4b8742 SHA-256: 32877b1806a82466994eefa8ee07044b9847c83b7d2d3c7e55c1f55ccdb5a83c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to download a password-protected archive. The presence of embedded URLs and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly indicate a phishing or social engineering tactic to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=planning+and+building+regulations+in+sri+lanka+pdf PDF link annotation
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/fepigibetugufemolozi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160963e2ff0fc9---tabug.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/25752390294.pdfIn PDF document text
    • http://didopack.com/files/99924962891.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/kewuzosetarurapi.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210531_115505.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a55a0461---juxitoredanobivevesa.pdfIn PDF document text
    • http://exima.kr/userData/board/file/jadovuz.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae94764e7---52533890555.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/22808541424.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/79474021195.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4123e2d6a0---mijaturazemafebesuvude.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/19502027437.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754f111dd5a---fopuzazozobatax.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/59795339897.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/jitufimakiraruxubo.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/detozogataxeruzawetiru.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/01916e24a8e283afa061a1ff5e3f5b13/78430921146.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/lodamawajurarodarupu.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/50726133988.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/zujixepilitirivozexo.pdfIn PDF document text
    • http://praguetransfer.com/files/file/83341907056.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/bevuvixeka.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a095496be64---tolamorumoguvozutigevatix.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_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 11004 bytes
SHA-256: 282bac6b0d3ab6c549bf984f30548b87db5d6dbb3e0782f18185c41c9fddd66d
font_02_sfnt_off00012085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 17108 bytes
SHA-256: 2d0264ef5aa099e77edb0d60cbb489b53ce18875cf520518c34a6f360226b4f4

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