Malicious PDF — malware analysis report

Static analysis result for SHA-256 4794e05271d675e1…

MALICIOUS

PDF

81.9 KB Created: 2021-10-07 09:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eae4d5ef44291afffa29fd8a22541173 SHA-1: 9f2ca23488250ceb0e84faf5ecddc08706fdbecd SHA-256: 4794e05271d675e1146bf4eb2acde82ca7eba1806be0abf76b7ae1f41d4bd7c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

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 https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/76795322949.pdf In PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/ronunesaxixobaxogubunuf.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7ughtdoancsad5p36mlrr73em/39167236277.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210910193017198.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/belisabejefonowumojoferot.pdfIn PDF document text
    • http://ds-dq.com/uploadfile/1632732364.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/40799556621.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5fe4825b4---guwijugokulazipobajek.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/rozovemotenoliwowinokut.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/xesonevudegejiwiga.pdfIn PDF document text
    • http://vkts.se/userfiles/file/gavabojimorafa.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/99696693255.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/12461038122.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/veforeradibiwig.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/90568916534.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/10703741230.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c5129825---sidukasofowefekitobexe.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/64716544038.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/patopuwemepi.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/60056803667.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/13148968860.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/nibixemibewelen.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/pufexox.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/lonarekojevuvelexuf.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/xaluwotapeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pooch+after+c+sectionPDF 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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 17908 bytes
SHA-256: 471527e3371076b08117018784af1502eb163bb61c8985b9f6107677f60a7cee
font_01_sfnt_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 10388 bytes
SHA-256: 87df758a33a5f3c5e24918ae8227e467461d5ffefd6ac50bd9582de0853a41bc

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