Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1efec686609c87…

MALICIOUS

PDF

71.0 KB Created: 2021-09-10 16:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57c0084e4869d808e8c70301a5e38953 SHA-1: a1c2aa645aaba948adcc1b92619338e41dd7ed32 SHA-256: 0d1efec686609c87cb8447f1ee2791dd35ec3f46717ea145684d56e25d7e0496
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 a machine learning classifier and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The presence of external URIs and the nature of the link farm indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138806cdeee5---28771973396.pdf In PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/34930596660.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/31591311445.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/19388308791.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/22770578735.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/89840232573.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a45280d31---40782073441.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/34053948329.pdfIn PDF document text
    • http://gaudi.tw/upload/files/79564309056.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/58043457150.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/12894698617.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161330c4c4e8b8---safipesakikagukijolak.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/84789432128.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/7895513462.pdfIn PDF document text
    • http://trieuduong.com/images/Download/74858833444.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/zaxiritogese.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/46159422421.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/20083054625.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/93127248728.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/mukapapogakilusamudonik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887b90fbbd---bikolozelojowav.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/6574574515.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/xafovotutisufuzapep.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/tuxemefamituruluwefobex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+manifest+editorPDF 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_off0000b797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB797 10452 bytes
SHA-256: fbd8e83449b0317f1df3f33510917fd69ec8b3b06617804e25b2be753bf232e6
font_01_sfnt_off0000cf47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF47 15176 bytes
SHA-256: 47aa7939eed357811f2c99a83034932e7b699d1eb61d4d650e74aef877e66e4d
font_02_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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