Malicious PDF — malware analysis report

Static analysis result for SHA-256 2900e8c1e543c516…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 04:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3dcc3ae4fb4ee9680d79834f530dd845 SHA-1: f3411ed8ceee9db9a36e481011e3c2f1971a0056 SHA-256: 2900e8c1e543c516b8f7a2833715c6e24644941e5fa57cbb7db73f5c987b5ff8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.jokilaaksonratsastajat.fi/file/81805963677.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/crep64kjm3iviomsen8j0jnvv0/54114577107.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4c2717d983e9a8e11707b3dc0e425c4f/vobizivavepojedojigasesuv.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/63000411036.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/fovijejaposamijivope.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/1678285180.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/73648689943.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5b278bd51---tefovevi.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/26364349107.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a28748ccc80e2120d7c58b9cad2593a1/wuzeduxidu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb48179c39---bemixaregolig.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/vulapifapisakoxawurunob.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/8a50eac0d79d6381e7408795af0c23e3/wafokejasitegagoladegu.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/38291238807.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/69605952468.pdfIn PDF document text
    • http://unseretochter.com/images/file/76771089343.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/getideduru.pdfIn PDF document text
    • https://plasy.com/uploads/file/liligozewi.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/mupidawavatuwumidumoso.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/dexarutesutederelikis.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/3lh9ph9irb0up89q4i3d67q8i6/44792484867.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vodozasibokar.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/38e96a2d8252e6e149491965dfe4f39f/95665048244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=merge+into+one+filePDF 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_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 10052 bytes
SHA-256: 4e159ea303f31d369ee39f78a1d9cc397e2270b352fdeb160665af33c64193fc
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 18396 bytes
SHA-256: f88de3516f68a63f58f3ddb4067f6f8573407fe7222c3a5e6f46f79bb1472da4
font_02_sfnt_off00012d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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