Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff200d57d5a7a619…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 05:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a37864773ad5f62110d43d340497a81 SHA-1: df2c88b6018404dee7fb85b10972cb37fe1f328d SHA-256: ff200d57d5a7a619556158d6a0e69c6638e89fbacf6282c44b235564cbe19f28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://pixomot.ru/uplcv?utm_term=download+aplikasi+video+bokeh PDF link annotation
    • http://airelimpio.mx/img/editor/file/67057322252.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/70240003467.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613551904ee79---65650606184.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a5c441170d1c841b38c78d4dbee9920f/xironona.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/narawexukemuxazuj.pdfIn PDF document text
    • http://gazetavk.ru/img/file/wufilagakoxozoze.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/majuriwuxabodobuwufo.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/60297541984.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/30418984308.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/68638090883.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/ziruv.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/92270829106.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/mizugazanezetok.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimirexiwezov.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/giwitadajururudix.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6eb5b022f288bc806e78de6741fc5ebe/newedabitevud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbefa019ea---xekabiwesimifomemin.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/vebopepi.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xuvabeminatazapezugafa.pdfIn PDF document text
    • https://cityface.cz/res/file/97751396006.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/zuteginilanamonovaraza.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/sevimebobagepe.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/98761763350.pdfIn PDF document text
    • http://umhouses.com/uploads/files/pivasupizosuvudebujuvud.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/49718374929.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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 10676 bytes
SHA-256: 831898055606900eedf9d8421d689a77d12047b3b642ffcfdbbd36ee0f04f711
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 17552 bytes
SHA-256: d3e522d71b0d38af6d31701a9b225dab95b95f62dce10f8880368809d7157269

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