Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bed6c7501ee0035…

MALICIOUS

PDF

106.6 KB Created: 2021-07-26 05:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f3d9c66d0b73df441e0c1db5ce1efff SHA-1: 0ea242b53deff327bf2c60a0efdf86adbb3bf327 SHA-256: 0bed6c7501ee00351e20a423d3eb35cd79712e985a2a1210b59b310f4804c2dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

Heuristics 7

  • 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.
  • 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 http://taketty.xyz/js/ckfinder/userfiles/files/mamuguralazorevo.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bcfc57dce---25755338223.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9273f0aa5739d826e31744ed5cf574bc/rutolutamojuripitofaw.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6776da99---69734621324.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/57126963678.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/5178240963.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/96375902153.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31209955585.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16092d58f4276d---gudekaredujufuwopuwa.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/fudegovemuj.pdfIn PDF document text
    • http://kco.su/userfiles/file/62474401188.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b7b85ef17---79799771600.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/zozekatarol.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/fobilukuja.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/pixezedovibomalupuleroxu.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad3d2ddad---53249459917.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fcb5ba02bd31e80f6b3e3b02ce61e05c/sotirijoketolezabix.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/bibarax.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5da4111094---25816941789.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c44d77bd64b---xewixofewuniripajugagavup.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/vl17mr6e8h8akdpi3b3ruuvaob/74758657585.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2436b3afb295028e86d354ff7489f5ae/rilasanirurupiruxinozixul.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f5cc9dcc---devuridunirumilewupazof.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/73956803995.pdfIn PDF document text
    • http://cmtsport.com/pliki/68077449730.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/lupom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+book+thief+quotes+about+rudy+with+page+numbersPDF 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_off000138f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F6 18288 bytes
SHA-256: dd4b53fb9acda6cad7ca756a246903ac58dc0ea2eb5fcb251e05da62194ef729
font_01_sfnt_off00016880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18097 11540 bytes
SHA-256: 461d1fe3d98d58028a93c46008a5c9bf38994e38b4aff01e8929ef1c8a247699