Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47843e4c6578042…

MALICIOUS

PDF

90.1 KB Created: 2021-08-14 18:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: abd74b49833b797a972eb3499b53ad99 SHA-1: a099c83588e1eab5a8f57334a1756367989b870e SHA-256: c47843e4c65780425270bce0cb485aa9f308bfee0de0eb8a5a18ca23837f8117
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gbbqjac6sn2us2bharkj53ikk6/78257863996.pdf In PDF document text
    • http://skomi.ru/img/files/file/9849662756.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9f1495a93---guxit.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/8b493093c5fcb1e48016dc332f2423c9/fuwasokukutipofidovib.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/21202765110.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/48ift68qeddg9o7rklv50avco5/30397418958.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0etf5ok934uigoqg7gjo1oslmt/sizorawov.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f447bbe6bb1f180c333ad2b77209d9f1/20072337757.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/41484103863.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/55863798187.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ef75ec97---44158509068.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/96443608116.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/2163738052.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/32979929853.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb1750399---90303721587.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/36693892162.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/25716524600.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dac81d66c---8421351798.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/30hf6tiqi11oi0n7jh99lbhttp/lomezevafarokidadodaj.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/79225350800.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/35955649186.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/toxisifozotagezosimodi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611769a2bb3b0---rijezaxijazadonur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=simple+present+and+future+tense+exercisesPDF 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_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 18592 bytes
SHA-256: 300d2f201b4820b8bf84cdad4b954e815648a1de0943fd2ca025a0d5e00960f4
font_01_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 10940 bytes
SHA-256: 667586c2607d51590b0b3103a5eb9bc9c412d4857b1a93016c273c16c1501953
font_02_sfnt_off00014157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1