Malicious PDF — malware analysis report

Static analysis result for SHA-256 887da0d2f3704c7c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 18:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5178522389fc8a8b3b71e2f0cca4c64f SHA-1: 23492247e6688a4a3dcb0a5e4a34b213590f213e SHA-256: 887da0d2f3704c7c727122e0da35e98d7e6a1eeb63daef7b80110641a0be622e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://akemi.ro/hirek/file/25167710745.pdf In PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/nubuzepuwuperij.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/29319669368.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/nofefedoxutu.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/23076662673.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kuderekajeditubo.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/wubud.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/33528660536.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988260a689a---boxulariporudolokilej.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/kejatiwuxodogimove.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/61108755042.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/38779377318.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/giwojexajizogem.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/nawimexulusojiguveki.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe517584b2---zifoweg.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba1beae592---69502204808.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1e96c985a---koboleguli.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/84060708073.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/pugozomixemiri.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/makajudasojemotepujegobet.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/guxubadubowemavojewet.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/ijl9g08ftde4m03g7tbhhdvar9/87498855394.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcda7854c9---78446347654.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1b29a5dcd9d0bae4653d3f27be1519ed/porijokotiwukex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=multiplication+word+problems+worksheets+grade+7PDF 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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 18192 bytes
SHA-256: e651366217623faa5f003feb7ffd32dbb1a09ab45ea8ea7c5d17a304be96adf2
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 11420 bytes
SHA-256: 764eb33610b7f1b1bf44f8c1c61e9036fe03a5be935aa2ab7f2aa444fb137e05
font_02_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1