Malicious PDF — malware analysis report

Static analysis result for SHA-256 e515afc84c6adb1f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 00:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 352609e23071a4b6dd9488975e11ff29 SHA-1: 382f1c280699cdb202d9e2639a95c50f4ff1cd1e SHA-256: e515afc84c6adb1f7e855735aabb47ec2b4598058d9bb2488a448ea5efa92da7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is part of a link farm designed to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://catamma.ru/uplcv?utm_term=mi+note+10+pro+update PDF link annotation
    • http://skiflogistics.ru/userfiles/file/34383615667.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/12064131912.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/48453574364.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c506198ac8fde15cfb2dce7c0394193c/dewamobikesozerepikejati.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/jetiga.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/bukasujamigekawuzuj.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/xadepotejozemanexejevod.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210910170930.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/wijovototajazowoninukuna.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/lemaxujin.pdfIn PDF document text
    • http://guchen.ru/d/files/33032190027.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/47255629297.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109101048216218.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/sexuwuj.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161323a2756d1b---22753646305.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/95327858629.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/zadopepekojironar.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/63168578249.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/fosokijem.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386af66b41f---sijimavanubu.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/xerinanabezotukopax.pdfIn PDF document text
    • http://villkasz.hu/editor_up/fopuvorizukorasixofoxo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/wesijegovikodasatifitekaj.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/81196623682.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16134cca15b4a7---33572323961.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 10436 bytes
SHA-256: 33404cc2d53b1d54ef1347c1019f0e802c1d911a08d3c7246e90f7296cc6cfcd
font_01_sfnt_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 23832 bytes
SHA-256: f431c18e9a5384dd57a2241befe050c450237c12ebac2a5d470601ff4f90f6ba
font_02_sfnt_off00011205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51

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