Malicious PDF — malware analysis report

Static analysis result for SHA-256 82df74aa3cb8a8a2…

MALICIOUS

PDF

81.8 KB Created: 2021-08-08 17:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 56e2c499b470c1520a8bb17a73afb92b SHA-1: 0a56f0263fa8ad64340c4b669518a19c417b25eb SHA-256: 82df74aa3cb8a8a212f8630ef3a9b2be153f8bba3b73cac9d2ceaf1572a7854a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://catamma.ru/uplcv?utm_term=maypole+8a+battery+charger+instructions PDF link annotation
    • http://www.conectadoscomdeus.tv/arquivos/file/69676949184.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/bibukif.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xabijolelunosunagasuxinam.pdfIn PDF document text
    • https://corghialberti.it/file/pojesisojuf.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/melurapafiwefefo.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16096cde4c0c3f---84106436257.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d6ff41d392ef623b2f9d0ee60b9e551/loxorubetupomidetut.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/zolemenukilakenidojimax.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/53881598875.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608394ea6c1a1---29069978767.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/puthun42lgbmqsf59ad8jrluf1/diwegatatowibabujuxavode.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0r3vkh82dpivh0j25cp7go9tal/jesasevetaniboze.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/67dbfa0b6bf972d928db6c8af6f6e1be/86226355873.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/6oq5l8a4mmo5pg3q7qbb5k2pn9/zefavox.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/88575960437.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/fevuxovidiwuvabovoja.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/87062280957.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/31428428073.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/50bc793aacf9aa6ec102865587d66a02/53540177471.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/rekufiwinugivo.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7cba2142a71aa5d506532155e9db4e08/10428630727.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092fd71831cb---xamepafibutefetowo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/35316d9b1e646339d18be1fcfc6c01e8/jidafizosij.pdfIn PDF document text
    • 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_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 11208 bytes
SHA-256: 0c53935bbbce6c9c3a1a95e96b6b3345f2548f968c7fc85f6b2e0097a01e7004
font_01_sfnt_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 16572 bytes
SHA-256: 288cccd6f2c90c326c016b52cd9535073789799269c864a3aabb488920119cf3
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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