Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44093dae3f9c5a1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 20:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a1e6c22c9baf4c6541dacefc6ae46e8 SHA-1: 1429199bed791d7f528906f725c75aa3041d0c4a SHA-256: d44093dae3f9c5a17b55df9ab95f01f9cb088b42a2eed93b446c25ba9706ccac
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. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irlanc.ru/uplcv?utm_term=alucinaciones+y+delirios+carmen+valiente+pdf PDF link annotation
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160772d596c7fa---lufexoravufijomefamifudux.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/57712456094.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/16cca5cfdbcf00ba909d57a1c6bf0ca6/94919787523.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/riguxasisufuwo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/66306557279.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a52f461eb---45972706002.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210719_834B23632D514B58.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/xokesutawa.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bff659d65e7---85930542399.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/xadubabasamaximated.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/66567610986.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/6d854a9d68b071a6fb60b9e914fc66b2/mopasebavufevefoke.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e36152b7958---24990260158.pdfIn PDF document text
    • https://banghenails.com/upload/file/napigojowonixawuwifosaz.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838ff3ed9a5---65697545825.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a665671ac52---51307179610.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294609994f2---88031772877.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e23129f75---28972960663.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/gekofetor.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/kodogavejawenanewerukew.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d2442848f8107f86bd0bd16b053a7321/77166704929.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b35bd06a---wewekigukuvede.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/walusazidagilof.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/sowiso.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_off0000b7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 16768 bytes
SHA-256: d4578c879cd1ccc63aa872ea5206748dc039a3e2434e1f3146d9e5ca1ee59dc3
font_02_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 11044 bytes
SHA-256: 82e26697d277451ca695d45a61cd35afa61c7aa19a15dfef8fd17109ea4c3be8

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