Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b050586de8599d…

MALICIOUS

PDF

75.1 KB Created: 2021-08-03 00:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b32e3b5e63329a56b3546ed441ffcce SHA-1: ab6c74db18d972734f12842e064178af3ccb7fa7 SHA-256: c9b050586de8599d7f1b36ceb3243dcc6877ed62e09bdd836f1cd248a3a1f56d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to potentially compromised WordPress sites, indicates a malicious intent. The ClamAV detection and ML classifier further support this, suggesting the PDF is designed to lure users to malicious or phishing content. The embedded JavaScript likely facilitates redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 http://3wsystems.com/shipinc/userfiles/files/nuxaroxozavesulibepojawu.pdf In PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/at8kukfhr5b6houb1uqbmbb346/damuwilefozowizu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/521e90a570aaf01bdf5cf4191f109acd/ligerironivavelaxugida.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/ruvewomepavometabu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a030900719a---sogafek.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/bupepiramujisiki.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/56391210149.pdfIn PDF document text
    • http://runo34.ru/attachments/file/ganapuragodowijuvitigu.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/putujiranokodatone.pdfIn PDF document text
    • https://drsaman.com/files/fijudasalijimiwowosavu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d06e15443---94816938331.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/2b60385ddedf9977b81f4725aa67e189/40808745725.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8056759a---12649214937.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8ev0meeg5njrpoqdpk8cai7so3/54347923708.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ac7a3e837---40344345576.pdfIn PDF document text
    • http://chamdure.com/DATA/files/kijudu.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/42968364206.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/db0nictn3jujpu43p9a8gfprcn/45455098928.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/jevuxuwofuvanexu.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/nubegijuzimu.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/19397641361.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/sekesojoferilujojuwe.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/74296620623.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/fosawesuxifapa.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160749147d8c23---tidup.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/80655089281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=volkswagen+golf+mk5+owners+manual+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_off0000c38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38E 11032 bytes
SHA-256: 497b844e58732222d2bd921d35ebbd50b88a49b55907df65a74ba5f61d51fa33
font_01_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 15696 bytes
SHA-256: f307c7f82bd40989b923f5b277bf8c78ed7546657bfa31400afd8882081f81ad
font_02_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1