Malicious PDF — malware analysis report

Static analysis result for SHA-256 8178c80f459fc80c…

MALICIOUS

PDF

77.0 KB Created: 2021-08-21 17:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93de4c4fb87f876ce3fe9fac1fb69a26 SHA-1: 3f992ccb4bf76f4a2e4b1d5a28276d744e04b2cf SHA-256: 8178c80f459fc80c0d2ccedf0f543b5432d31bf579006d355cf66181540d806d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on compromised CMS uploads and disposable domains, likely to direct users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hoanggiaphatstone.com/upload/files/7027148479.pdf In PDF document text
    • http://milwaukee.center/userfiles/file/75870727312.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/224159a87ef55531c15f9213aad6b39b/43732189194.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083a45c02c04---25667394646.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/jibozigesojuvoxe.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d465e9b9fc---sikajepakunuxetoriv.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed5b50f40---jijifamumovidubobupubiwol.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/95550663327.pdfIn PDF document text
    • https://goldenapp.net/file/wuzuwunegovozurukepu.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/dutusuwudidogis.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/22192356596.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/10328169699.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/lupirovuxujagifanekojezor.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846d5c9cdd8---kefanalupazobeba.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1f8cb3cbf---76666279950.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767919855b9---bomigofukonobikebowum.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0381e442d6---lejokigewi.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/75773409929.pdfIn PDF document text
    • https://ismart99.net/upload/files/94613558949.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/dinagupadotodewuna.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9029845dc---67839065076.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e953fc41b8---85597496450.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ea2usv9j1je8br690mt0ib4c2l/75732499589.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/jenafematuledazapuxak.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210716_8D36EF48D616769B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=seafood+restaurants+near+me+mexicanPDF 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_off0000ca34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA34 16296 bytes
SHA-256: 6394411e6b430958991f11a743173489aada94e462ba9bf9e612b1c72a0ef5ec
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 10868 bytes
SHA-256: fa4c1c65ec149b1b22fdaa45beedd17b2e18c29832c0b46603c26b67fc5c84bf

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