Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1536ccd093c7793…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 21:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9ca822c10e6b99fca3223233043b227a SHA-1: 26777ef38b0fbb8e17f89b77dd0a28fb8bad07d5 SHA-256: f1536ccd093c779333b3d68648bdd6eb2ffe632d5f587ffa41749a6ae70b2830
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/92f9eea21a07904fa9c30b8e6b1a2641/89593487452.pdf In PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/tugaronoxekizemoj.pdfIn PDF document text
    • http://technocom.pl/editor/file/bozadewukemufabutoregolu.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/panijin.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/tpr6aht6c7aicdushrub9nt2nu/21717471167.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/pupuvaxaxemekovadewulup.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/60700264588.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/sizavosora.pdfIn PDF document text
    • https://grancom.by/upload/docs/madewimadorovokupoz.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c27127d77---27723600728.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/gikiwawojiduvovipeni.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/gejaroduxokeg.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/wajigabugafepirovokoz.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/57628701212.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/99061748522.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1433cc59716d85d031b2c53092771f50/53404965572.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161294275f1a37---felupokadibaporobuzuk.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7149fe97---75776568790.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce07d10731---51997739280.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vinitizofuzo.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/78422036716.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f28920782e140776aac6c356023a78cc/67558900114.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd695945497---xovelemebavivobuxafejivo.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-8-5/20210805232416607342.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3fcdd35f695d4527435a9c2a5a31e4ed/16525877757.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e22e9ee2d97---nowivubezakofovuronokot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=les+clauses+du+trait%C3%A9+de+versailles+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_off0000e42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42C 19068 bytes
SHA-256: bdc1182cb3ac06633ecd2963b7e5864fd0e535934ed3d716008f462dcb8611e6
font_01_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 10664 bytes
SHA-256: e21adae61b9a90ff35832d9e90fea12afd2fd4782248c83c5374932a3f5023d4

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