Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3c1091a079b352…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 06:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1461b83ca57a8cbd652f2d84ed3dbc46 SHA-1: fff1aa6365718cb8ad6575cbbddb95fd082555c4 SHA-256: 8c3c1091a079b3524d82adc598a7eb7005eab40313e16cf98c73c1031a9370cd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV heuristic strongly indicate maliciousness, specifically a phishing or trojan threat. The primary function appears to be directing users to malicious or compromised external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gryfarmerskie.pl/pliki_wyswig/files/wibebajogetikuxebev.pdf In PDF document text
    • http://gabortech.com/admin/file/27086015368.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0f7bdd090---nuwudokenab.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sviongmp1pjsnm6t158l7bf2m2/dobigezafamegup.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/naduzuposesofugowabalibus.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/mizedo.pdfIn PDF document text
    • http://abpaluso.com/upload/file/24094128403.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e20d71ab3---wonidudijakatevijak.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16075d22fd4735---dosipekapepase.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/jojutobusut.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/feledoxepafidexo.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7341b6a41---zetibopuragosela.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/rawigirejenixesopan.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/simixunaperoreletebofa.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/23339288983.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/narowafogupoxilazo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d260c1dfa---jixarejezuwav.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/fotavunib.pdfIn PDF document text
    • http://gdgom.com/upload/file/210710011249338160l3opa77b4yg2.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/26569800602.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/fvc5qk512qnhov2bnvdkg1igcl/sexixiduguwijurex.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cd79a8eda8687176eb8f5ccb008bb57a/misavuwesuvapulefikuweloj.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4084b1c752---19390879422.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/90960785260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=multivariate+data+analysis+pdf+free+downloadPDF 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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 18476 bytes
SHA-256: 7414d09e39dc76f67bbd2f451aa5a40c0d621d93655c61c4cda856aa4f629f02
font_02_sfnt_off0001321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321C 10848 bytes
SHA-256: 2994f998d7cb9ce61dacd08279a3ef1092c207d0019722bfb65d48bb11b6e0c7