Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae231df084cc1d8c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 21:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ab957353b0964f5829988f689340d0d7 SHA-1: e67931a158078a73982d2bca15e12e46888ec047 SHA-256: ae231df084cc1d8cd504e3b553f1053069506b41266a17c704b56474e0dda464
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wastran.ru/uplcv?utm_term=pdf2doc+online+converter PDF link annotation
    • https://all-new-wow.com/upload/files/lixubisafatebesurilufo.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/jovujowipimanozolukadu.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kulatiwexexivanelupif.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/7811100649.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/kixunupidazipipe.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/rinodunumokamebizite.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/gusinusewozokamo.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/59672814815.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/palaj.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/49953694915.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/54786918102.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/47202286853.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf16fee113---nejonidoxijudefumipexip.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/76657481543.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/torovo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/feparojonu.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/49890926287.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/65222590451.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/rupalotobasusagizosetokak.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/86d759ac3055b536da40164aa9eee0ce/9118096344.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/55577742139.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d30d603232---samiwox.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/guvilawasobuzuzus.pdfIn PDF document text
    • http://cissi.it/userfiles/files/jumakoni.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/vibajutizisafibuloti.pdfIn PDF document text
    • 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_off0000c3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 16420 bytes
SHA-256: e834e7caf00202d3825ad838c2f55f023baccf36931385d0d9db75858d7fe93f
font_01_sfnt_off0000ee16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE16 10324 bytes
SHA-256: f2c6bb9ed5f1f11b67cbc3d997da421752ac44becebc1eae34bdae4aee9af52f
font_02_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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