Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e3e7a5b318a6e0…

MALICIOUS

PDF

69.4 KB Created: 2021-09-02 14:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cefd4875c079da5adddbb2909c9e1e4 SHA-1: 9e41424ae73bfc2cef25ff3045999a27e28c0091 SHA-256: 85e3e7a5b318a6e0e90d13b65ec01cc00bf9e1f088d84e34d9dacc787b659772
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links pointing to various external websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=baikal+mp+153+manual PDF link annotation
    • http://recrute.fr/files/files/34820126821.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/nobaduzab.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/96384484028.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b0f33aafe---jasonif.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/aea23c45ef174e59f12b77aa140adc98/kejisozimototuwusewidom.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/julemutopixijejomukula.pdfIn PDF document text
    • https://phunhai.net/upload/files/11407942334.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/wajamalinutiwopafenef.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/72498127970.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/8948773400.pdfIn PDF document text
    • http://ipceurope.com/assets/file/tijeko.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/16dc1a0645567c114948dc328e0354db/vokimovedatux.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/918debaebaca0d134e07d688530710c6/83980775375.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d6c4fbe7---naxiditipawojaxaju.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/wuzanejaveriwajuv.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/39948805118.pdfIn PDF document text
    • http://www.toptehnik.si/images/vibekibumazibij.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/78513078531.pdfIn PDF document text
    • https://areicon.com/images/file/30867911705.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/vojesufozesudizudi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607778dc566c2---gizupugoroxiro.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12020166829.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-16/20210616155629925086.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c29876dccb8---revopu.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_off0000b35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35A 10400 bytes
SHA-256: f87d520b67e689123cd328af0df9754ca48b9558281cec71841c726b9bf0e996
font_01_sfnt_off0000cac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC8 14672 bytes
SHA-256: cfc22eb47c34940b24db71a85dc0a698751d01e8703d323ed5deb5b75bbfded0
font_02_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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