Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df456a50994cb4e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 15:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cbd919ee55f07b740ffdcfc2161b33e5 SHA-1: e787166bac82ecb5fae9591a56d326c221ae3189 SHA-256: 1df456a50994cb4e0b52fa369c1c8245b8307301bc41430ebc335509b82f8368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=cat+needs+food+badly+persona+4 PDF link annotation
    • https://sitycare.com/FCK-UserFiles/files/dexewezekelelonop.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/10313951064.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16146b400a4d8d---pasudewotosabolirufez.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/21312588761.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/dukubigilakuverekazoxime.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/lejabilojinedoromi.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/fuzojowile.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/96495182362.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161349cd87942d---59748611832.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/nozuvare.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/95443212721.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/fozinokilukudetinarofodul.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/59231499560.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/70012415289.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/20119560275.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/54784302785.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/rugefupuxoxeroluwemef.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c54e685981e67e574cf884de305acfd4/gofonuludelitipupewega.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfe33e74d---roxajowinogabasanibotad.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/jomimiwunobudutapinut.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/54724837301.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/nibezagapazotidunamodizo.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/7013788011.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/bafamusefop.pdfIn PDF document text
    • http://mylead-journey.mandiricareer.net/contents/files/55031152503.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/woxalate.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_off0000b7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A8 10760 bytes
SHA-256: 69b980c8e64777729582cf8a8fd3d3d681c3e6b0fbb5d34ae9f87c1c15f3b449
font_01_sfnt_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 17104 bytes
SHA-256: 083df73cd282f124e416b6c255b3d9a387cee46207f7e1b78e2437c9bbc42b2b

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