Malicious PDF — malware analysis report

Static analysis result for SHA-256 32be3d8f6619edfe…

MALICIOUS

PDF

80.5 KB Created: 2021-10-07 09:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 70e670b3603d58ad6bf54f5399f76387 SHA-1: 78330ee26f4ad61ddcdf8ea72fa606bc0962f64e SHA-256: 32be3d8f6619edfefd6b85670c7f020eba7d9e0d38498b8e93724125671ebbcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2d794a6d---fuwonewaxixine.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c07c927ed---telikugofupo.pdfIn PDF document text
    • http://fteq.ru/files/file/44659966623.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/fumekorotu.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/60886671331.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613870329b01b---tenetulirapewipumokabizit.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/24940450015.pdfIn PDF document text
    • http://dentherapia.hu/files/file/62872607825.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/28941365865.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5da2i1hc1g9prqn3drab9nhvva/kawude.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/15743517236.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/budetutesitu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322a08c5133---10912133203.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/wotefitigamituk.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210921090714.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/69469547081.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/kozotixulomu.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210918064542.pdfIn PDF document text
    • http://snsi.jp/image/news_file/28661872716.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/78604632372.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/0o00tjv2bpm1ps1r0p3pogu9n0/22423044117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=do+my+due+diligencePDF 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_off0000d2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D8 10400 bytes
SHA-256: edee2bcf4a5ab5fd0c376e3bdd7eaa2c06c59ee7e377316d2dc701ec653e070e
font_01_sfnt_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 19024 bytes
SHA-256: 1348e835958586579055b010a3ad428ce30d26eaefe039621ff2bf08d29947b8
font_02_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1