Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1d1ab00d3f7938…

MALICIOUS

PDF

88.0 KB Created: 2021-09-12 15:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cccd3cdafb513f2a2af3d352d26446b SHA-1: 335465da251ac7eb754562d68fa0f33339598ed0 SHA-256: 7d1d1ab00d3f7938ab115908595eba96ce4d3e04166e1654a583437794091ad8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f8a2d0cf---nevuw.pdf In PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135e95c7de67---88196757299.pdfIn PDF document text
    • http://esipro.be/userfiles/file/mijosupak.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xejifiditalubonisuv.pdfIn PDF document text
    • http://yilip.net/userData/board/file/tosafupax.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/89521694921.pdfIn PDF document text
    • http://saint-party.com/media/file/46332162557.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/95275197737.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/34528376368.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/12785362832.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/garujimofawolosijeles.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/68774325806.pdfIn PDF document text
    • http://52963566.com/upload/file/202109060124310467.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/16121166179.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/davemojemab.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613496dc2da55---90340451955.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/barepawewufusux.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133460fb48ba---4354102252.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/zoderudori.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/36581744888.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613B5E5D1B1BD.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210911211012_f4x4bs.pdfIn PDF document text
    • http://leguido.net/files/12394483518.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613926ef6a28a---44080750338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+free+android+stargazing+appPDF 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_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 18628 bytes
SHA-256: d73c88d9b945ca4893cf45bc0806a1c224c8ef19ae5ac21628f7a304d930c42a
font_01_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B5 10740 bytes
SHA-256: 98ef2f7a2de69de8a26b09fa4b31676ef6b2ce4ee57e5ced3340700701ae48fb

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