Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6a188a3d027864…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 05:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8007ee758348a46db693fec8079bff27 SHA-1: 0b4c71da6266967d99000e1ed8d15130276489dd SHA-256: 5c6a188a3d027864266c1647bc67cb7541bee854a1a9e6c31b16bd26b1e0bc0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm directing to multiple domains, with several URLs pointing to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/abb71f1db4f2822736e3b5f26f1a06f0/kelofokixavogumuxatabut.pdf In PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/momevifotipijek.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2eea0bf1a4bb967e9437621f65fafa91/xafolifigilobenuveb.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/nidike.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160782088dc602---91931414783.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/a34mvo4422un38q7g8c41cqrls/6661932598.pdfIn PDF document text
    • http://myesen.life/userfiles/file/zusudike.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/08f52c377e58dffc6bd165933893d099/gedobetunofegavikof.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/63017330095.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/49737972f24a35fbaf6e45d6c83082c8/18058078444.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/63953206530.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f6439b48422---93703727921.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/4306937954.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/moxenenewofazivawedidaku.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/44506870326.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/vuzedugafesegirokepivudi.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/97080834612.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607920162dbe4---20350022353.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8fb155dd206cb751c2606509ca7a3bdb/torekidadezopav.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/03a9ea0b58a2d9cd8eaae36acba554b3/luzekijazifitij.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/dadujixevuloxezena.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/dabenuze.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/25989725391.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/3345993633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=learning+pyramid+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 10480 bytes
SHA-256: 06860505a1aa7b6abcd9d385e14c23db65eb822d2d16df14ddfcabb7e5f8375b
font_01_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 18584 bytes
SHA-256: 212afed355b2da40800ce12afbd36b7cdbbdf2e7038e4f5db5f08013b2ef6cd8
font_02_sfnt_off00011dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1