Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdbe896e6283146…

MALICIOUS

PDF

94.8 KB Created: 2021-08-20 13:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7d932a4272beadcc27c3a778753dbe5 SHA-1: e5e0118a840de8017552408cd987119f77ff7f80 SHA-256: 8bdbe896e6283146c774ac9addbd594d566643698ecbda8d7c6de103c00b96e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF documents used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nemeckystrakac.sk/editor_uploads/files/71950952496.pdf In PDF document text
    • http://krevue.cz/UserFiles/File/vefananoxoxafijoloki.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ealpme3r50pp4jv9nirq4ecc3b/kupelolewuxuvike.pdfIn PDF document text
    • http://midel.me/userfiles/file/zifunuburebuf.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/27034160748.pdfIn PDF document text
    • http://k1a.ru/images/files/file/63835352042.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/91056410634.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/tujonogutalujonuf.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/nasilewixukigesijoni.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9lm90qtoioevdl0bjg23dev385/37593424670.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/28101963376.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210816_054826.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71368916d---deserebitazusexema.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/pn0ec7mhj4e1clfjgb42deopu4/daxabalofazepimazuxijen.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084967478859---61019786216.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/wawiduje.pdfIn PDF document text
    • https://unosms.us/userfiles/file/39779269860.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/koxoruvataf.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/94003462874.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/42678588510.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/57815964879.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/23793964260.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/95528711451.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2c3c7eecb---50000540774.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/u1sn39dajtfg3jn3r6v6m4ahlq/tufet.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/841b06c0e5a6ac3d39dbf2d343252c6f/527695015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+better+at+cod+warzone+soloPDF 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_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 17580 bytes
SHA-256: 529d7d6d932a0df34cde701761fd32facb126a7c78102cac6c7a800e2af52ca1
font_01_sfnt_off00013a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A36 10728 bytes
SHA-256: c0d38da00f9a042450825f47e00011f731ed061000d5c4d98e79438b01658e6c
font_02_sfnt_off000152e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1