Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b54754b33c83247…

MALICIOUS

PDF

88.9 KB Created: 2021-09-06 04:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8910d9e5fbfb622d7b6749d9ca52c507 SHA-1: 5cea0a8fe037e0f3a09a491a16dae37e6c4a56ce SHA-256: 5b54754b33c83247cffa3c8b50c4ac7a78e3ec518268b75a099453675d571eb0
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ik80600hf8eeql2vghhmj2u90q/35362674443.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c540b4c0---zaperagigagukanugafavo.pdfIn PDF document text
    • http://muszempilla.com/files/file/68203890815.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b76f3cb359c---54100200396.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608121fe13e72---38184936324.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/6378254095.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/60182249059.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/tupedulelomuzeboxog.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/65b3d37d424f5391dd3d7ad2d104ce4d/vujegeluvuzafeba.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6482709fd0---63768186338.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/327836d754d7054b07476225d1ee3a1d/posuj.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/zomopowumelubelawiputepu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8c6d35e3bc5276c770a63299cfe21b5e/lanilaxagonudorekuwolisaj.pdfIn PDF document text
    • https://melz-feu.ru/upload/36009160995.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/74386479623.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7239197da---bawijesuwosopijare.pdfIn PDF document text
    • https://wecareprogram.org/images/file/34901665225.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/97979083593.pdfIn PDF document text
    • http://trevorhannant.com/89814733884.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/vizipowegokazab.pdfIn PDF document text
    • http://dalaichau.com/files/kopib.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/jazipitisowoduvixemulof.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/59225671013.pdfIn PDF document text
    • http://kustari.net/userfiles/file/xurusajuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=objective+cpe+workbook+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 16468 bytes
SHA-256: 5d1da15950d759006e15d5485583271edf6ee95e7fd26eeb3fabe0f60c5049b3
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 21576 bytes
SHA-256: f639e72a659d11fe513221ee6f00a3c6392ba62aa56e606e703052a21c6f9dde
font_02_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1A 10672 bytes
SHA-256: 18fbea9f28f94296f9557f53945922c7984133d6830429e529164507247a6eb8

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