Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9ea4edf5dd6ee2…

MALICIOUS

PDF

69.7 KB Created: 2021-09-13 17:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0320e480c7c9eb39e777091b62aa231b SHA-1: 8fba503b965b1ed09856b4f121050e2b4a60c5b4 SHA-256: 4e9ea4edf5dd6ee2d47a54b32508ba1e537ca27478056dd56d7c28980f5f0fa7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing or trojan payload via the linked PDFs. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://linuxnewyork.com/draft/media/retisokabu.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a17775bd---tosefoduz.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kemakif.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/28232316057.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/16098110177.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/jisivasagegopufitedem.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/48432065273.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/31253814762.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/75926913033.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/bf24fcb3a1ac72c9130860cab8bea818/54330978657.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/jejowipobonibi.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/gutexixufodu.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/xokepadifudinagokemes.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/70271301868.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210913094824.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/16856991680.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/52636951617.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/8857731699.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/69761768887.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/pidef.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0849b0f7c---zopanuninezipoxepafukup.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2ed9de8129b0639964783c0aa753ab1b/lokaro.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/sosepovezorifijes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=uc+browser+mini+free+download+for+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_off0000b2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB04 10772 bytes
SHA-256: 558e8f3864678b78c116a9b554d09206153ea18bb5ea05e5a46ca597be4223e0
font_02_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 14880 bytes
SHA-256: 393e1963ac6ab4f8f919f2dfe1b2b4a2485954f5cb44ee37d3bcd3a10cf7c2da

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