Malicious PDF — malware analysis report

Static analysis result for SHA-256 444de7e782a99c93…

MALICIOUS

PDF

92.1 KB Created: 2021-09-07 09:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 751e94a8c961c4f5b87114ae3c4f4427 SHA-1: 05d5d1a2a0acf360610313214e48ee762b6eb468 SHA-256: 444de7e782a99c9339bc10bb607c6ba4ab2dc134f84120165f30e23740e4f399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://chcial.ru/uplcv?utm_term=duromax+xp5500eh+manual PDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5df1c9f036---werevaxadegin.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/97854610895.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/sojupemeputibajodelilifip.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2bddb9485828a27cce39658ac99ef7cb/99500789197.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/zitelazefevo.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/13584425213.pdfIn PDF document text
    • http://ridendo.cz/files/file/ravazijenipodurodaxunik.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e82d546d---74465411454.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/29554978707.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/mipunobu.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d19ef1835---saselutilovivejajekoz.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/4608617324.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/89273822820.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/7c323492067030ac790952faeef13840/85704942090.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/96206912928.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a35740e3---zinamibigipogejisikob.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/ddce567bd5d88aa8f6ceb88bf1f04c58/nuvixiluvegelimesot.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/659a28db56769b64118b57ffaad83686/88240077628.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac37d3c31---darefuxenutawukeleben.pdfIn PDF document text
    • http://stasta.com/userfiles/file/47676943227.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/dovoriw.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_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 10620 bytes
SHA-256: 4e483d5d48a7fe68cbdfbd65f1ef263db66285b86d064d952d4d442f762bc1ca
font_01_sfnt_off000118ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 18900 bytes
SHA-256: bbd3b49b938faa49c30ee6d5357873e9b617b881b71afdd0317e51fbbcf586c4
font_02_sfnt_off00014a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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