Malicious PDF — malware analysis report

Static analysis result for SHA-256 d688b90dec9e16db…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 21:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e785b81d41d457f9764b6f9482e0e1df SHA-1: 46e725ba2f738b47edfa1d2c0a49f9b6dd63c721 SHA-256: d688b90dec9e16db9d070e4fc0002e2e2e1fff0968dcd87a64ed4f2bf62be65c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=video+downloader+apk+cracked PDF link annotation
    • http://kowel.com/ckfinder/userfiles/files/1631707740.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/95563848736.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/gonepuxusesedoge.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/60985625437.pdfIn PDF document text
    • https://krusomying.com/data/file/nazokodilob.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/rorovomu.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/tozanososapawutabugev.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/942545aede37289f5f7f92615baac229/8162363944.pdfIn PDF document text
    • https://felicityokolo.com/file/fakanogowilapusolifigo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/20ed9aceb81eb8b4938dfaf66cac171b/70495641217.pdfIn PDF document text
    • http://jph.kr/userData/ebizro_board/file/fatisakotejonoje.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/35115578546.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/44680010958.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425f6b9fb3f---264695215.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b030f3d4e1304a531b71ee2dfae9758b/gafitepubugoga.pdfIn PDF document text
    • https://harmony.im/userfiles/file/lijujakonikeba.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e0b6431d805af70566dad30f89b2340f/nukupoxijozam.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/46573268677.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210910_052457.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/87892852317.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/tanaziniwibitizazavaze.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16359885455.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1c30169415d209bac3fa5f95d41a398f/31416440707.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/tijalofifaxajefilubiveb.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_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 10388 bytes
SHA-256: 5dad3229a5cebc9d11bd691e4b9c1bd5a0842fbc976f99843999a02c0b43a03d
font_01_sfnt_off0000f86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 18336 bytes
SHA-256: 7fb81af0ad586c1153a26221a876393a713bd81003daadfcb3b7c641ba53292b

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