Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aaef9fce8b1b514…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 12:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 86a9a0001930736bd7999e27df25e8fe SHA-1: a709fe7dc0f21a65daa0fb6f9475e2943372d82b SHA-256: 1aaef9fce8b1b514854b10c86dd8021400f6fb3e8284857b263b7473a6a6ee55
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The presence of a 'password-protected archive lure' heuristic suggests the document is designed to trick users into downloading and then opening a password-protected file, likely to bypass security scanning. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, possibly involving a downloader or phishing component.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ccsl.asia/files/norelipitiselodatusimaz.pdf In PDF document text
    • http://atmaircenter.com/lb/userfiles/files/vokusuromasekokalijari.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613737186c2bb---28006514779.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f9ceead5---depukogojezaputuzupuxukev.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/49303956396.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/kamamovusovirurofonokabuk.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/75037967674.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/mazawabiwatonuwafazefu.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/34033775686.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/87168616067.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/galejovurabit.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/nibefoxov.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/kedujupimokemofino.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/2197379962.pdfIn PDF document text
    • http://idcla.net/upload/files/gepezubuwukefumodut.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381fbcefa93---57280724221.pdfIn PDF document text
    • http://samtekelektrik.com/files/12351434936.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/dadevimikeragimudebufug.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/masudiwumilaxoseruxaruke.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/081230251625.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/xaraxewigubajubapijibak.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/28216425743.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/34205297252.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/25794688668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=unpack+zip+file+androidPDF 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_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 17564 bytes
SHA-256: 457ebdd7e90706c095fed455bd1cfd01d386295cfe4e2faa90af4b73eea8eec5
font_01_sfnt_off000104bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 10508 bytes
SHA-256: f691ac343b508f0ac341985c396a85c9e64b9906319791352623c49cedb32103
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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