Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b477638f3953379…

MALICIOUS

PDF

86.6 KB Created: 2021-09-20 11:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ad09c36a2a3b9bb0a53055f7dc1d57d SHA-1: f9b29a03a2bd597ff957a823d04b5c540d59c83d SHA-256: 2b477638f39533793880cc5cb6d00b96c49fdc9560a75cc20528e3d24dc50d90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure for users to download malicious content. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a dropper or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=fashion+design+flat+sketch+app+download PDF link annotation
    • http://karpatskiles.ru/store/files/94619703043.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b0200afe94d8ce510a7cf327a9bc8912/gaxibugariwaxix.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/jurirenejakew.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134d03c8daa9---lebimebis.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/dipiviniworetevomitoxor.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/jesedojidexuvu.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zirobusanokudonipi.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kutoxax.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109200716371532.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/95448111179.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/90535357875.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/zagepowomas.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/45441891806.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024eadcab8---wadigojudug.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/65048439635.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/lexajaguj.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/5830753450.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/xikezaja.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/57718272469.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/42630075664.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/34783793796.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9src9um9cfe83c82ld7k22i3fs/bisaxixog.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/95156652340.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/36743281225.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/galibexojagipiveroman.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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 10952 bytes
SHA-256: 90e782d05a26a6bc98770382566a9feef2283352b8bbe030a5ea3d70bf0aaae9
font_01_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 18360 bytes
SHA-256: 9c3aa4364c0510d42405e798d74037b674a7e92a73d865a6902257eb47918fa2
font_02_sfnt_off0001348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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