Malicious PDF — malware analysis report

Static analysis result for SHA-256 754864be831bc72e…

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 22:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b0e467aab210e459fe134b0b178ea4ec SHA-1: ac0321fa4d7ac284c09231ef850e06ac2a6b722c SHA-256: 754864be831bc72e2bd4005677201f85ac76e473c9dd3f1145ff14edc2f8dd39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3ba21245ba6c2189601f641d5336ab10/42962518126.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f98b5bb0129b91731f9051b3073f1681/zopigerakojinim.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/fshbc261a0cgd9ethharqh2gb2/53158331884.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/649ba019979629a9871e1560a0bee252/pinutixagitavewutusojeb.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dbc7acfd6b995b1b3b40355691531483/89961727737.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/ligozoxokagozoz.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/pelapejufezavodigix.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/39847799711.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fb1fkmapjl70pmfa4pchprc7e5/6248523810.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a0732e1d2---ravatagibafuxanulas.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/xufukoxekusinekeloromota.pdfIn PDF document text
    • http://jarosi.hu/files/file/73007265655.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9926d8a75---jojep.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/64084816880.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/nerobeto.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/decef862b003eebf3ee5ae70bf135578/wedasinusivi.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/sikefopilafiselomona.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/a8m9kshn1urqptvafm74mcvkr5/45763109329.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/pejekimujefa.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608202c94dec6---wukabumilezaboj.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/468054237.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/wivirakadosus.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/lopas.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/32253811856.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/gowakubawokuxo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c37544b1b03---rixesedidafubuxobabuwutup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=creative+product+launch+event+ideasPDF 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_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 18120 bytes
SHA-256: a6e2035df73f4e9a2baf982eca8b97357828aa411ae194d7054f2ea5dc4dc6a4
font_01_sfnt_off0001397a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 10808 bytes
SHA-256: 3cf8796055946bd892dd70a496379f248dbbeb0a2966f87b33eda46e3fd650ad
font_02_sfnt_off0001525b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1