Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33729f5138407bc…

MALICIOUS

PDF

98.6 KB Created: 2021-09-09 08:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64d379f86f502d13b9a66b556d1d652d SHA-1: e916c635c54ca302e9b6d553ac9f894dfc80ac48 SHA-256: a33729f5138407bce191fab12571e6849d314bd64d8d1bcddf0e8a80dc83fbc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://laborke.ru/uplcv?utm_term=android+move+data+from+sd+card+to+internal PDF link annotation
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/sewizogit.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/48626274439.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161393f5f17f1b---tureraxa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bd423819f---mitati.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/noxelaxutotaloseber.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/novazu.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/tivalamidiluxemetibopu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a499f970---10112301783.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/93283556590.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109010314533854.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/zokolakapuwitum.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/52534722086.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/80783850087.pdfIn PDF document text
    • https://makenie.com/upload/files/tamel.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/bewenado.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/togudas.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/zawev.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/32673621815.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b833752650b9ac3c3378f8f22be5f8bc/geximidebozowisulazonese.pdfIn PDF document text
    • https://esz.jp/img/editor/files/wufaletanumotagotiz.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/28356727493.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bazapeme.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/nitikenenova.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/lubokosema.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/bavilepazuwuxes.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/9504575654.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/juxazorebutuzexapedodafin.pdfIn PDF document text
    • 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_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 18652 bytes
SHA-256: 0e5d61e105ae95473f5bd25bbc0537b09aef3e46063022075bde43cc2a40c0f6
font_02_sfnt_off000163c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C5 10684 bytes
SHA-256: 1a41c9393bae5a78e3cc6ca8b93be7fe954e9168455bcf71328d3d0a0d3bb91d

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