Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fa5ad02e19885b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 07:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a663a9e7a8a31a62758f817d88b0011d SHA-1: 6b8949c435b0d0578ff420740c2d0a5f379536a0 SHA-256: 57fa5ad02e19885b9597259b46724bb3c83bdd1a4fb9fcd9d8dd4cdcbeafbec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable or compromised hosting domains. The embedded URLs, such as http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c5ccfe6d---56171545141.pdf, are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://uhy-th.com/image/upload/files/26811411515.pdf In PDF document text
    • https://xn--psg-9lac.hu/files/files/61117866422.pdfIn PDF document text
    • http://marcuspietrek.de/MARCUS/files/file/kilidurokenum.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/topodojodutidudomedoduv.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/95934066830.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/juxorebisitajen.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/60720070402.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134444b9c0e2---debolesezegafogenozut.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/kokifoxufituvis.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb292bfabf---vugojewudamolevewepafol.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/kobavuwigiv.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/tipazejofivefuvi.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/wiribaxofabumofelu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c5ccfe6d---56171545141.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/80661816248.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/44636220100.pdfIn PDF document text
    • http://kaies.net/upfiles/21091809493860508979abom.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/86921695207.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/92384271932.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/23530853909.pdfIn PDF document text
    • https://tekartltd.com/upload/files/5892854467.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/57380658947.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/346f7bb9e913b1f330aced21c3a50f67/33716823449.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/43214508236.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/kezabejilizaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=video+player+galaxy+watchPDF link annotation
    • https://b2cdemo.tickets.com/content/files/80430335775.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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 10792 bytes
SHA-256: 0bfc7998ee6b10c45222e502a6dfc18d2d5eeef9b45d93fba694e64ba43aed06
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 16812 bytes
SHA-256: d09e16a6e2ab399ea36c9a30e11b503ae37f73aef5ec17354c792e9343b4172c

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