Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d0681a3f92e88f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-09 23:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c1d5161a3433280ed245f33e258d91c2 SHA-1: 306c4ad6bdd51076984982ce6026e6cbdd718da6 SHA-256: e7d0681a3f92e88fe5ca4cee9074b6c633dfc4452e27afee05c6e3beb87f42de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Numerous embedded URLs and link farm heuristics indicate the primary purpose is to redirect users to external sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=best+android+processor+for+gaming+2020 PDF link annotation
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132284dc2054---sebixad.pdfIn PDF document text
    • https://festacontinua.it/public/file/demupupefejokeponefine.pdfIn PDF document text
    • http://imbirimbir.ru/files/6676604614.pdfIn PDF document text
    • https://msiutilities.net/documents/zivofirukekenin.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/nagozekexirosujugutefenem.pdfIn PDF document text
    • http://www.grifin.sk/files/75964557038.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/pamedetonunivevulesagop.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/96149384777.pdfIn PDF document text
    • https://limadelimon.com/images/file/4988318890.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vopexapabagakosadig.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/gajifaraxadunixadilugo.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/fudilemimolabafuxas.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/rupijatokid.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/32962705938.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210901192903.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/doginidudegufawom.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/64857415745.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/zevubiwilifi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd48c1f2f---xekolewutazezotobe.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rl6ubccnnoohbddagbb02o0egd/jupinaja.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133063c4b39e---82160201019.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/9813130485.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fewolizukowomozimaded.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_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 11212 bytes
SHA-256: 2a18a3a425326dc08d12c003e6cbcfd18a4f07ea6541d2fad1f32aa3e7e1ed7c
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 17348 bytes
SHA-256: b07d6b180fd6b2324f8621b37a0229411046e84bbfc2f271cfb062982cb647d1
font_02_sfnt_off000134a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1