Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f08de509ab5fb8…

MALICIOUS

PDF

103.9 KB Created: 2021-09-06 01:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f257f94441afd223df3e6c3f8180c012 SHA-1: 26f19b2b48e2ce65902619296530e3d794d0d9c2 SHA-256: 36f08de509ab5fb87dc57f34e230d96979be0ef6f1c5bddff2eac68fe966b60e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being used as a link farm, directing users to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://club-integra.ru/userfiles/file/wisosekalokokawizobemide.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0e14c37bd---vozavojorujatisedo.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/tebatonoverelujurubovox.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7aa882e0e36b5186f4d1bd5c2e34b19f/84986081494.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/38384272338.pdfIn PDF document text
    • http://tano-cable.com/d/files/dufujipexofopuxajadenepi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b18989ab---75952294857.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/88437449586.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98f72b98a5---wevukawivuw.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d964f7a42308c7b163c95859b7eeaf51/33395267316.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/8161869442.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/f1670b4f1119d3a2b1bd2b365d5bbf2f/59280591227.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/wakutomumuriguxulize.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/56aa7c7163d7fcbd519f154398305622/totefefekewon.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/94704280619.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/37922216864.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/govodemora.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3c77993bb2333825c6dc04e812228270/kejagisowidiboriposub.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210511191737.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/65554019853.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210622210158_k2nv3o.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/35668076573.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d00a91517---82453783430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=limitations+of+cardinal+utility+theory+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12875 11056 bytes
SHA-256: b8aa9c2bd6dc2f2a851b2e3a638bed0b31581d50a3714d8ec419edd17d5c0d2e
font_01_sfnt_off0001420b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420B 21400 bytes
SHA-256: 26e82ce9605e1ca30bd73c12a0275810a4f0c737b1db0d0fd2ee23454f13b53d
font_02_sfnt_off0001790b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1790B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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