Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a434f468d3d1a6f…

MALICIOUS

PDF

95.1 KB Created: 2021-07-05 04:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c03030ad8a62e5916de61bf6546beaf1 SHA-1: 0f59514d15b67773abbe84fe14a9cab128d4c73e SHA-256: 2a434f468d3d1a6fd2a0a9b466d316f99c084175d5869365f7aea9cde916ea65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links are likely part of a link farm designed to distribute malware or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160885cf9deea9---domilofodojuzisur.pdf In PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9adebd4f51e2a78fbbf18100faed2e6a/parumikiminaf.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d8a7c40ba---39230836746.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/bamufawugogakexe.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/gokinapiluvudaberodinese.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/puwizesakuluwebos.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/lubajisurununoboxowuwiz.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/kepamunuzisenubosijoput.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839075fd84---14693274734.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/bivitupawukad.pdfIn PDF document text
    • https://koratspring.com/upload/file/4313602111.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e98d98841f---6122167513.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607094a2115a5---pitep.pdfIn PDF document text
    • http://aweibel.com/Photo/file/142644203.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d3qvf6v0ndr38901gfdgr38e5q/29425624726.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/17673559322.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/minatusumusi.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/65379149049.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d81ed109f---20541362709.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/25097386287.pdfIn PDF document text
    • http://bptramptour.pl/files/file/66608063567.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/940780946d91021a480e9cd3e1d80215/68538742894.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/04dff37bc8e8c398f0f04e58fd0dc8bd/wejusis.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9135069a92befd29db90b76a1e218d9c/48663894676.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/48e5a1a7bf955e6655434f5a33817b7b/jusepopukir.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a84fb605e28f976be908ad2a0a6016c8/wuwevibedi.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/76752764366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=design+with+pic+microcontrollers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 10684 bytes
SHA-256: 8be49eac6185add3588be341b4757c4fb2fee1e90f8e6197957498c1a3fe4332
font_02_sfnt_off00012731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12731 10992 bytes
SHA-256: cc847eb3d00fb1830902211cbe121c4e86195450b32b71057cb2bae8fda929f4
font_03_sfnt_off00014058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14058 18036 bytes
SHA-256: c0275cae5998fef1085c719228041cb4aaee99373d085a3684c94b67a799a6e7

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