Malicious PDF — malware analysis report

Static analysis result for SHA-256 136af40131b827a1…

MALICIOUS

PDF

104.2 KB Created: 2021-08-15 00:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 796f2ba28bbafb62c6c69ade371f6d19 SHA-1: 694bcfbfd738b993080e84a29016881dccc591d7 SHA-256: 136af40131b827a1875b1438e0e23a9b8638ae9c84de416b3445c6f920571649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm intended to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6e98689c0483433a53b570dda29bfc4/1741489031.pdf In PDF document text
    • http://hrzservices.com/uploadfiles/file/kabagujitabolat.pdfIn PDF document text
    • http://strandedtattoo.net/file/bajamenor.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/ditonatimimezof.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/jarinubozerapixobefafid.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/30609585755.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/xolomowifubaxexavupoxosu.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/mekipidimitidirapakadekeg.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/64682919451.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a152ed82da---51830827122.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0up2ee7ob10c9gm1r5i7vi9mf4/kanibibaziz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751b484362---judazafelatobimen.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/lewerowomufipibatilabu.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/22872003434.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/33016783869.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/kisebitizerubiwolun.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/89992913532.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c8c8e275a---jemekulu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/zofofezekisasik.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607577b3b1f91---25582951721.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f4744a25ac75b24e113705d2122a34a1/7285900356.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/popiwubunatomajugoxati.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/51973482096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=gym+workout+plan+hd+images+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_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B66 17100 bytes
SHA-256: aa4cd09a46938738258b990069ba1615b682393d6acfeb0b1b13b7ecb5ee0cee
font_02_sfnt_off0001783b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1783B 11268 bytes
SHA-256: 8cd341a26e84d9650020b9c4583a8ea785e6d075d09ad82bb66a75d2107454c7

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