Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df269a2ae51188c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 13:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d264e0db5e69903c84b3341a6fdb722f SHA-1: 15e0d8d7db781b91124207696f81fc606f8126b9 SHA-256: 7df269a2ae51188cd70354c33f1d1268a2e2c83b5df0b28a1ee087aee6b4efb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://coretry.ru/uplcv?utm_term=reduce+pdf+file+size+acrobat+2017 PDF link annotation
    • http://aimic.com/userfiles/file/84242477951.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/xegadetisutojulixosefuteg.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/8611244843.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/11df1f48fa533b3c06511ac264bd00c0/xuwep.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3ca1b12ad---kolaterijerejedimawube.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e293820c9---xujogoxobixasokeji.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/11957841690.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/80927631857.pdfIn PDF document text
    • http://kasargod.net/uploads/file/8517322634.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/cdabbbe083c00fb0820ef58bedaad919/loxukitebusa.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/28760706949.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9479b3182---67171010263.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/80398322058.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/meliwidefelitatazaguza.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085625f8a522---49729648746.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609b795474831---wewisekisibadaxekevetam.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/borazifibuzobuse.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608772ce19406---morefojifinawiguvubuzixok.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/tugifuran.pdfIn PDF document text
    • https://samowar.me/upload/file/45649344626.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210710_040548.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/63248599973.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/38127865795.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/98010808893.pdfIn PDF document text
    • https://mfdesign.hu/files/file/55403942917.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/78719362922.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_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 17232 bytes
SHA-256: 5fef4b5fa5c641b94223c69158162e96c0643e1c4c490675fe2af38b45ace52c
font_02_sfnt_off00012f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7A 11200 bytes
SHA-256: f86bf0041a958ba8b2d2e295431218df9e394a0c4469c632f76a2f15838dac8d

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