Malicious PDF — malware analysis report

Static analysis result for SHA-256 2982753ea330dc69…

MALICIOUS

PDF

85.1 KB Created: 2021-08-03 01:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ddff513aa0c130b286688d1a62989d2 SHA-1: 96d8257ad005744fb1c468b7b9918d7233bd4fb4 SHA-256: 2982753ea330dc69cbe6e682f4e52a364b05b3e511a9a9b29cc1dcdcdc439395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://amadpich.com/userfiles/file/xirugowawagivotetusi.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fbcd3a6abeb---89389461817.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829fada098e---domeposokevagurozaz.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/vavawuwubivilixevepukomo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf78d7850---10404194948.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0153863d9efdad0021987572f4521917/81482473560.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///totes.pdfIn PDF document text
    • https://atesolve.com/ckfinder/userfiles/files/kusowofaladugubirapug.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a916b5ac041---54844982037.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6d732f6555bc6dd4a60b947b30958908/73437778524.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/zutot.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3e3424bd985f1b8403ba27ebe7277701/riluwedenodisufu.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/13031081869.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee8786d680---wejiwisekewibakenej.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/gimewekotajewagake.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/savimipumelofujomazumol.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/48114195345.pdfIn PDF document text
    • http://huimao.com/upload/66790510726.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/eef6cf86c9bcc554f838a4d150b98743/zujokezonulajutututimobi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a7cbe4abb7251226d56b1c6c1ab78294/34500058389.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210614_B7FF706406FE83B0.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/majuwesekadito.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/tifawu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8t77uf3pv9ahp3hflr4nhesnu6/ligukifepag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bmw+435i+gran+coupe+owners+manualPDF 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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 11244 bytes
SHA-256: eb2438e5d3702e12bc9c3df7fbd99d5083e3f2b0d0838cf6a0fd4078d80d098a
font_01_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 18112 bytes
SHA-256: 4240f766505c86792007ae3b95579270fce1844e56ce898c3cd6590b9e46f77c
font_02_sfnt_off00012c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1