Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b8477f631e8f6e…

MALICIOUS

PDF

99.5 KB Created: 2021-07-15 11:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9cd4f4ba4378669923a539981017e96 SHA-1: c47c58b6d66501e31c1b99856cf526b30546b563 SHA-256: 88b8477f631e8f6ee36cc6a3aa7491d99694e95d2b3f6b47493151a790d49c7d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c789219740---15643405813.pdf In PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/32240628704.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/muworemo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/6dfcrf9fvkm5qkbkqnkn7loj98/95816614457.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f6197ad9---pafajegebuvam.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/jilovozopugu.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/86917986312.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072abee172a0---kuvekulivotor.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e4d78f667---petuzovozozevuwejonumejo.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/78093750763.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e1b746e053c510ff10e5fa765d1df217/79254937901.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/pawomupetimafapenomu.pdfIn PDF document text
    • https://2acontractor.it/images/file/mutuzonidiwolulogi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae56459ea---duzizi.pdfIn PDF document text
    • http://heizler.hu/files/file/87326596110.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087587e40411---11097627295.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/mopiwiribagopa.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/kutekupadisixiremi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b5e64d39---37994482292.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/kanebaralawodupokejafurot.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/zelilaridivowena.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/28900794477.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/3208706919.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cccd2e877d---ranumuruwusewebid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=i+want+to+fall+in+lovePDF 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_off0001245e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245E 10040 bytes
SHA-256: f02be639fb846ea01cb1f65252d23c650f2d8dfe048f457d020e5a4b036d61bf
font_01_sfnt_off00013ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADA 17592 bytes
SHA-256: 6441d8e1cf8097748cb886ad6478203ea6b59131249def8304ba28b5ef71fd6a
font_02_sfnt_off000168c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1