Malicious PDF — malware analysis report

Static analysis result for SHA-256 032daae73f6637a2…

MALICIOUS

PDF

78.7 KB Created: 2021-09-01 09:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3704819a7085dfbac82366a29780029c SHA-1: 51f4039cab14a20bd9de33070817b7c5aafc37c9 SHA-256: 032daae73f6637a2f3eb75a88fb065a2b3de82b5571a29fdc0f047d8dfcbee80
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or exploits, suggesting an initial access vector via spearphishing attachment and exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609272f0710f4---7817538676.pdf In PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/174dc4b69263be2fa4d896f9dfc903fc/33639794664.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/54153709033.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/e52fb118c30b0a72f1b2ba867ba43382/11043256494.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/rakafadozisoxedivu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/u3c46d923kub305pv42cbratl4/79954623541.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/df1a6cb07055c5a42dca5112d8afa2c3/lizadesematibulewu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/sisenileketusezaxefowobiz.pdfIn PDF document text
    • http://coffee33.ru/archive/file/99321638714.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/roduzu.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/22469088365.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/94649135792.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/23913628856.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bded81b8cb---92740367491.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210707_123AD0FC75C660CD.pdfIn PDF document text
    • http://hasyo.net/files/file/pesotikedusewip.pdfIn PDF document text
    • http://chamdure.com/DATA/files/84723401199.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/10264007202.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/20d22639fee216b689d8edcc12715d4c/1205948127.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/33236352635.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/popiwokiwe.pdfIn PDF document text
    • http://tianfonmm.com/d/files/jokotedebabeje.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/90041057325.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1528d5a5cf---40688874260.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf13384cc8---nomoxizupigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+compile+cpp+in+terminalPDF link annotation
    • http://irodori.kir.jp/files/file/59269641781.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_off0000cad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD5 10444 bytes
SHA-256: afbb4b97cbcf7eda954e8c48631e75e659416d1c09216ca2d5f64add38c7db0c
font_01_sfnt_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 18900 bytes
SHA-256: 7f449c09566c62870fc572fb285ed5ac4ec1a3646fc47d7c161cb91fe2c37998
font_02_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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