Malicious PDF — malware analysis report

Static analysis result for SHA-256 7539c22e08862bbd…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 21:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6ceeea0e9e242dcd6b843cda9a9b2a7 SHA-1: 697f403436d4adb9a505c9811797409a4f39e743 SHA-256: 7539c22e08862bbd1ec1010aabe002f46e359bb694809d01cf6d7ff30c0ae703
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many pointing to compromised websites or disposable hosting, suggesting an intent to lure users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

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://laboratorioshamalab.com/userfiles/file/32049771233.pdf In PDF document text
    • http://sb555.com/photo/file/zudosetefi.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/72431646160.pdfIn PDF document text
    • http://anpo.vn/upload/files/58604243850.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/uj18fkmaj3viptlgca35t54s9h/mejebizut.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7f8859d40---tizazibaponupu.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/24828661020.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b63e68c63---bulozipupanupunomugadez.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/29883515123.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091312061750.pdfIn PDF document text
    • https://aspirans.com/files/file/26708404085.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613715ed5c0b3---5955293213.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/puwamigovob.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/bukofaxumofozewoz.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/buforufiserasobudatuto.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/89926187244.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/30578815229.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/13770711749.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/61263891349.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fedazigubas.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/zizubakizugitoj.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/perifozixaxolavuxi.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/59020184718.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/80137759861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wcc3+original+apk+downloadPDF 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_off0000b9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DA 10636 bytes
SHA-256: a515323418b96422db096abf16bab92126470bb933bbdc8efa4f0c43df5f461f
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16880 bytes
SHA-256: c4f4539be9f039a64a6aae0ed55dc1aac9a12f35a6b98dd0f84e0cc55b72b3f7
font_02_sfnt_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1