Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6de88cdd537abf5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 01:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 901a80ae08ccc388c594935d367bbfbe SHA-1: e6a995f3a621983efccea5fc2bf6a7e3ea6a14ea SHA-256: b6de88cdd537abf55963e68f7517dff2b355c8e2e5656030871dd485a4acff4a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=sky+wallpaper+for+desktop PDF link annotation
    • http://taxicityplus.ru/userfiles/file/1484094464.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/nopunab.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/kelasunubuxiturosovajibat.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/raxoda.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/todozutevadidijudo.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/36310963796.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/wemixuvupuvumisevil.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161305a65ae58d---zotovutexuzivivipotale.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/28907449154.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/11164392035.pdfIn PDF document text
    • http://metallpress.ru/files/fosuvuxasewoxo.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/71571443014.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/medeje.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/38c094ff93a6f4b9defef67d5f0d60b5/14135616892.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/disikix.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/85843033077.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae986ee42---zugoj.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/66776365676.pdfIn PDF document text
    • http://banquat.com/userfiles/files/zurewagikekemir.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/nibokaxelidilujofuram.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/nifulufapakarupefumexitoz.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/10549252658.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o8h0ndevv5b7h4g28brn7upkku/bojil.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/85903260778.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/46891392680.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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 10664 bytes
SHA-256: 46245216e1b5bdf4a0ac57e380c601cc468e7989618b123a0b1fefb197ab1424
font_02_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 17740 bytes
SHA-256: 4e23c98f1c36fd663bcc501a2d6eb0a07e577f50e1835266477c0ed72d86e333

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