Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d75886b656d05e…

MALICIOUS

PDF

86.6 KB Created: 2021-09-09 17:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99e5a26fcc10bbb56f9f08b5f716a57c SHA-1: e1f2eeaa5232032e3dc0e026edaf13bc83a00b9f SHA-256: a9d75886b656d05e59ce3e4caf018ded736f9237fa71b33750fc16181b168050
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall detection suggest the document's primary purpose is to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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://imosa.asia/uploads/files/202109062105009477.pdf In PDF document text
    • https://exihomes.com/userfiles/files/pedozexorimivunikazokodot.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/68692236872.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef10ea63d1---zasevonefu.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/44111321652.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/79724567702.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/gepatewu.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324c6fa22e9---51896725479.pdfIn PDF document text
    • http://bienbao.net/uploads/files/gidomiwujuzokuseza.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322d72416c0---72454904137.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/99608645294.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/58808152536.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161354d79502b0---veretiko.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/44237064331.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/timuwoxugoraxusagas.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/wosomepuwajovod.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/22001700638.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/38954594517.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lugaragafegiwusajetuxan.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631067951_4c1984151c.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/zutizawonike.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130240d20188---laferapezukanipa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131308d131e6---pupufadazedokugofubisafop.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/tapigivijedodeti.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b83b1f7f---jimulevetetamivu.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/58401095189.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/moxozatajazuzedap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cara+membuat+foto+menjadi+png+di+picsartPDF 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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 11320 bytes
SHA-256: 7419bf4fd496704e3ae499b80af0aa94ea49a0476ae9ba14dfef778ace61940a
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
font_03_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 16440 bytes
SHA-256: 59677a0f4dd9ad1b87c3f72a6b699f1122fc21b23ba28e282594a79511e4bb8a