Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f46f0ef8b950152…

MALICIOUS

PDF

70.1 KB Created: 2021-09-06 15:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e274e75f30b22706dd50e509ef6d2c56 SHA-1: 5b965d428c6991eb7eda4405537f5f51de25184b SHA-256: 3f46f0ef8b9501522fa048444d55b40b31b4e0e9cb0cf16fcb926f2636053edb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV and ML classifiers flagged this file as malicious, with a high ML score of 0.995. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://malagi.pl/user-files/fck/file/meposunoreraxobofitag.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffc681a55---36286937024.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/30124942945.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/nuletekodakokisi.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/57527038010.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a09a512be9---vemitamisoriposobezajefaz.pdfIn PDF document text
    • http://mesahighclassof64.com/clients/874441/File/tofejizifoluwelanugog.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/jogag.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/pazuxodofog.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/42659854676.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d5a5ab032---luzuluzusexixetov.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/nonazumokiwivolefajem.pdfIn PDF document text
    • http://epicridesnepal.com/files/90409251030.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/24253873566.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/fixilivodofo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f729f86d7330e8e86818d57c52425aef/31173443811.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f0c592fdf6dc70631c9c36a7891fd80c/42655967976.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/rojerutodiwusojemujujenal.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210808224213_82178042.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/wumivubupiba.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161026334535c6---11597006103.pdfIn PDF document text
    • https://actor-conseil.com/files/file/rubotogaduzorerisugoxek.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b3fab16f---97807980644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bomba+de+sodio+potasio+atpasa+pdfPDF 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_off0000b2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16148 bytes
SHA-256: 554533dc26f7d1ca8f678339054a23bc65096c06f0d92c4a6bdec6353a2b95d8
font_02_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 10604 bytes
SHA-256: 8328e9e8c10eeccb20d09c417b9b0722c1a3c71e9f7acf0c2e71f23d5d8d34dc

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