Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dff4c52c7765aa…

MALICIOUS

PDF

106.9 KB Created: 2021-07-01 13:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 93fee9e829adea40538e9bbe05c7be11 SHA-1: 36f733277695d8feee046050360cf752b17ae43f SHA-256: c1dff4c52c7765aabf0b0b6b82c14ff1d37ce24136ec9caec0c36eaff1da931a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b520023622---xipalijawaxarepeworagil.pdf In PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1b37f4ebded64f9caa6ea8ac9ff593c3/79013276454.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c4b431f9275bebd80f51face71a4b5ae/xajegakunenerifujo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed19491ec6---10175747471.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e5421a782c689bbf95e1fcb23f52fe9c/dapame.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71cfd96fe6---tanunatezele.pdfIn PDF document text
    • http://bronia.org/userfiles/file/padosoraxibekiwekus.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f31ff0addbc3ffd8381ce560bee20d3c/27637414658.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d6877e1616e---fejivuguwipagimugor.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8eb6f9a1cfc0fa53d45d1b65c2a654b5/24807774897.pdfIn PDF document text
    • http://93564497.com/userfiles/90422896286.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f55099ca---notizan.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/51871828005.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106271847472445.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a6c10ff464bc59e4c3e17ec4e0683bc0/76055963542.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce703720e8a---26517844892.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b70c4fbb5e1---58745391451.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4899d24c42e680fff6705a14096c7aa6/48555278814.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/91362409951.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2af7a7ca262c288fed90c1047a411bac/45568513310.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/32997560680.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c546f178d5---rosafodefunosenubise.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/74321629762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sonic+mania+mod+apk+download+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017183.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17183 24172 bytes
SHA-256: 5ecbdfc307fcfb63c35c817b23daa36fbb72dcfa94f9557f809a053c2d7ed9e1
font_00_sfnt_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 3200 bytes
SHA-256: b4695dfed51f494d3e5aaaa92d883fea89281739b14d45a7e5a8c12ee1647a1d
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 10528 bytes
SHA-256: b6a9df5bf9cc98859a5be61806c8a00d3905ef2e47354b3e1b5eb072f376869d
font_02_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000129af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AF 29156 bytes
SHA-256: 2ed25ef7c59d10ff2b629768aae4480875245f8024346dc5f38bc9333db995cd

Open this report in the interactive analyzer, or submit your own file for analysis.