Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca05aca2b92f0d5a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 20:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 830bbe36e2913ca48663ef1e2a63385e SHA-1: ab5d0aee47ce0b8fa4f9995d3061e076a7b8a9a5 SHA-256: ca05aca2b92f0d5af818aac7b27a1b411f833a1bc5ac120162a493c8bcbea5c6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or further malicious activity, while the link farm structure suggests an attempt to manipulate search engine results or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135dddb29a83---bejawoxugiwixoro.pdf In PDF document text
    • https://zahrek.com/userfiles/file/86919234756.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16140257b88238---zigaxevumoxigavadikijibe.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e86fe0644---2765615015.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/11436207886.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/xagaruwavalugusun.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/fevizazipudagipe.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/ruradamabonuseseponip.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/72517637416.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fa3d060c4e843acec0172e91daa8e54c/82865632145.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc25b5a883---papisusizig.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210909112418.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/46205578809.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/93340461004.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/guralivawasavebulo.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/60507060575.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210918_004706.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/16704882752.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109171938426408.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/85026839442.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445b2fe5615---20829343614.pdfIn PDF document text
    • https://red-adlay.com/upload/files/83131925704.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/fariwamedisolomizolid.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/jefof.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/45958118926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=aplikacja+do+s%C5%82uchania+muzyki+androidPDF 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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 17988 bytes
SHA-256: b56d4b7b996a27628b83f823332d1382888e95bf45fe9cf8512c2c3777ec13c8
font_02_sfnt_off00012523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 11096 bytes
SHA-256: 202e555b1cffa7a65b5305f731338ae55e4b0acb777ad13395644c920d35790f

Open this report in the interactive analyzer, or submit your own file for analysis.