Malicious PDF — malware analysis report

Static analysis result for SHA-256 788b43cb3d860632…

MALICIOUS

PDF

85.9 KB Created: 2021-08-18 07:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7990889f8ec99018f2eb13c5b6a36f82 SHA-1: 0e3742c66b31f33e348d813b0a59e04bd469be2b SHA-256: 788b43cb3d860632c8dd1d69f36a7bc8524c9a81da4bea31d8087fadab07ecef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these compromised sites as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608837c238c4a---65201603416.pdf In PDF document text
    • http://ahcxdq.com/uploads/file/291434125045.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/33049812172.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f74880ab80c---46385906539.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/88335c87bd03a20de966225cbca9dbc5/92713584915.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/oj2e38bqcc70qqg93i67mv1bmd/48652386922.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/tusuzaxeruzawexikikegu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/pebibisimimi.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/47219940815.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f628fe3170fe0c1299840e6cb0e6b37e/ruvujesip.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c251db5be0f---bizixotizatufepu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f295850c58---lidevefezufowajapimebeno.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e000c2f38---17461061954.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/golifojumetudanivuju.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/71570661305.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098673f432af---norigovexujatexovigovir.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/89136194325.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4b16a02e040cb49344b6257f960ec7ef/netifodete.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/13466200595.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609963ce02390---60477199673.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/rabenorameresiwaserug.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a00965e08a5ccdc8567e5ecf64363f7a/zavetirofa.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/95931644162.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/24033788723.pdfIn PDF document text
    • http://vodnik48.ru/content/file/96220004589.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/55027673746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+de+oraciones+compuestas+coordinadas+y+yuxtapuestas+con+solucionesPDF 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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 11104 bytes
SHA-256: 6edefc3f758d6105a7f4b1942b0a46baf870646307be29e54f548ff7069438af
font_01_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 17312 bytes
SHA-256: 75a706305654c3ec65d3d22d2991f004295a0219241b6b8177b7bb255d7074ea
font_02_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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