Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f0e018862f460f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-17 00:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16bd1f803ade6896d9a03f184850fdb5 SHA-1: 6ab1be104800d1e5fe5783f1e9a3d9da00b98a97 SHA-256: d9f0e018862f460fa71471adc35eab1847eb85ed4e11c2ae9db8a8bec539c718
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users to external sites through deceptive links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://giasuthanhdat.vn/Images_upload/files/xabunevavuvak.pdf In PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/xugulobemegeni.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/borexutugefozozosu.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/41407414783.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/bikegopezexisimafevim.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/fexodufe.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/35084017458.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/videwaloronixigene.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f12b218421751de06a78086cf4a62c0f/38923142795.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/36385219015.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/nenilogixevevolemaxigab.pdfIn PDF document text
    • http://xfswchem.com/upload/files/38583055739.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/64993977945.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/kusejonimevejoverasovage.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/dufesesosiximurajefak.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/tosokijokevisitegenim.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/tobajavawivuri.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/tanobifoguteripa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614164cc6d990---dudurowapi.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/26779164763.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/9739571157.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sepalo.pdfIn PDF document text
    • https://best-label.com/upload/files/laxurenafafijuxizenogaxi.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/69509767117.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/24a8e44c7ce4dc747cd140fd23c28f25/35968740790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=video+guru+premium+apk+free+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_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 17668 bytes
SHA-256: e1ebf09bdb9b3a25ab054427f32a7c01bc1e3dd12010ee84dd23d41cdff48475
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 10824 bytes
SHA-256: 6a9653491fbc4f2c2c4a8e909b09db87604ff7a91ef440359ccd86228e12ac1f
font_02_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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