Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a25c1edeb8c15ad…

MALICIOUS

PDF

102.3 KB Created: 2021-09-05 02:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78f399312edff1ca3c89a9eebcf68b89 SHA-1: 3556c478f0767eff27aade581a494cc3e40c9f4e SHA-256: 4a25c1edeb8c15ad374b8f550423da0d63db3a5a1a35771146d4422dc0febc18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure attempting to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f8178ff56a7a5ae93dbdb12f1751c249/kunepubabizawamisebofa.pdf In PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a7e577eb---74270498582.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/sasalavegevo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b776dc191e4---21871659897.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/bdd715a3bedf183a63ac6b059343eeaf.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rvpvn7rol7krucvn8sqnk351h7/lelawetufonifigeridatafed.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/43530189709.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/71462952412.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/kotirivarifutuzifedidul.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9247b45b4---lusukifigekolozajoze.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/raxeluromuxafejexizesita.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a585458a61---43062040551.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096207dc7e1a---fijuwujubekisudef.pdfIn PDF document text
    • http://poorclarescork.ie/images/juwurepobapu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/59368446575.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/sigibevemobotusobovape.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/88236828092.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210815051854.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/limevuxosatuxofoxok.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/26580175054.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/nusotugakowolimolubiv.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf58151ea75---fonojiv.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161031d82d0f48---beboritikiwujofagepit.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/potomozunokavasagipatanik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tipos+de+cuchillas+desconectadoras+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_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 22168 bytes
SHA-256: 7ac744913a15cdc8f39e0b5f6fd550a2d94bf4adcb878d3bf2429df6a2a9a367
font_01_sfnt_off000158e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170F9 10780 bytes
SHA-256: 008769f00f76941c99cfef12cdcf9ab97d67676f3f17762a0f9bd52f474cecfe

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