Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e0b8088388797f…

MALICIOUS

PDF

145.5 KB Created: 2021-08-23 09:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 162b7ec430a538835472b35b90ba89ed SHA-1: 8bdc55422a669348c0263ca6366ecd61dad0bdfb SHA-256: c9e0b8088388797fbadd4dc5fe3b2dc5a91188a27839658ce532511e1910e2c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to exploit users via malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://infrive.ru/uplcv?utm_term=health+policy+fellowship PDF link annotation
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7b195f7fe238855ca821cbc122e835a5/tafiz.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0211e6863---51681991883.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6kv8igo714g1j83u661bks2rbb/72971041328.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/regidorinipugonexijadev.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6118389f1dc3c.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/26278841803.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/86315187570.pdfIn PDF document text
    • http://ibb-online.ru/f/file/burijoxadigor.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81d2d5e28---wexirodetota.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/k59eskmov0bn06a8oiq2s7pf8s/buzazifijotuzukanadunozin.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ac618885---80724951526.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f61c5f2385fb9aee5725f2a4f8e07458/86897179419.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/vimetavobavasowilamaguri.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/vetol.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/nogofuzokamisifekijasaxet.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f3a777e68---65561644264.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/14910511665.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/saterawonifezirejonavedo.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/46254498632.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e077a58e---wowesidubigekaz.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744c0a6d833---45836962289.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2ffbc03f1---53125256655.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/87956863314.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/tajupixo.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_off0001d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D901 10564 bytes
SHA-256: 16cce90b79a59e8fcdab683f9619377eff4d86519dd934bf037a1312ac67bf9b
font_01_sfnt_off0001f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002095e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2095E 17464 bytes
SHA-256: b8043bddd9ed2e72f5a33d435792f58ab061027d9b243070557918420f41ca63

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