Malicious PDF — malware analysis report

Static analysis result for SHA-256 b848ac499f4f2ca9…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 05:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24d564ca2379bc85a536156db90e9c99 SHA-1: 651a249bfe036c57ae4a3b6860216424c1791534 SHA-256: b848ac499f4f2ca929b7ab0f27e64b82a64944c694f156cfffecdfc2e32435e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm that points to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://baoveantam.info/upload/files/8060512540.pdf In PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/2937396784.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/nifukiwik.pdfIn PDF document text
    • http://kdesignuk.com/userfiles/files/taxalatapuvasavinulo.pdfIn PDF document text
    • https://msiutilities.net/documents/fivujegaxodono.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/19903994125.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/nenilafetusugexixivumezum.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/lotefuwiwof.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/lowikomudaf.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/58758486087.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/c37fbfae1de8f27aeef300e64878eeb3/bikawit.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/20565396296.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/964c3dc1e9a96857f198fbae12923f20/65177334027.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143413e8e65f---xamigo.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/jisekonujomoperigego.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/20647071603.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/1775758023.pdfIn PDF document text
    • http://ceroki.com/image/files/89429003560.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/fajisukegojekofakirodov.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9c42c5eadabdc59df1217919b3d0ddbb/99841055020.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/jobimuxewalijuse.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353625872ac---90950815504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sims+freeplay+simoleons+cheatPDF link annotation
    • 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_off0000af5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5D 17012 bytes
SHA-256: 0da8a441cb7bb21a286dde7a6d1e352844dfb764e814f3725680daba7b14f81c
font_01_sfnt_off0000d9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D7 10936 bytes
SHA-256: 62c510a8aa9d89c2e106f8c43154c055c9208a73bd793aaad1e52bd61a0948ba
font_02_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1