Malicious PDF — malware analysis report

Static analysis result for SHA-256 d228feaa1db41358…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 09:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 394b72d44dedc86f573e541199bfc5d0 SHA-1: 1d5e35383497c0de0efbaa326191c2050c22d403 SHA-256: d228feaa1db41358eeb508e45ed45408f9fbc7175e4ef7a68f47687a25d2bb4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://rm-parketi.si/uploads/tijelinevukinojexerugus.pdf In PDF document text
    • http://bannhuaduong.net/upload/files/rurulikidijikitifar.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/13260584085.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/983ab12aeba942a96236690bb4ddf2d7/9447862001.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/nudodutufu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3878ebe62---vukowimudebolafefaripox.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5fa95db4f3f92d9ef5523ecb77482ffa/73783091783.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97548362c---wiziriwotetubetetegozomu.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/36f44a36ad4e3ceef521c4aa153af1ab/wakazaf.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c207edbec---joselarepa.pdfIn PDF document text
    • http://bjjiffy.com/upload/26754937804.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/kajifidineditotixidota.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a708ccc8a2d---25523633626.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727eae80a11---jupatirazup.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/dulixozaxusitilomisudowu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf6bdee824---tositituvewuzukomowuripi.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/tadikonajeloxuv.pdfIn PDF document text
    • http://ed-union05.ru/files/file/54026513365.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/77408456575.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/pavojefewasutufowil.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/74903942907.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/kuderexivokejiten.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/2a32bde6572c72e0b33067904342ade5/mukumikejimagofaxami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=leave+application+for+employee+pdfPDF 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_off0000d3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 10752 bytes
SHA-256: e219fa92284344d78eafffa38b09b336ed2019b506306830c93e1bea579d575f
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 17864 bytes
SHA-256: ced191f41794b2cea05d7225fdeb332b4e756ad3adcf90eb24954966638cef2b
font_02_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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