Malicious PDF — malware analysis report

Static analysis result for SHA-256 f543ab60d91bac40…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 14:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 961ef411650035736be4439ad758aa30 SHA-1: 8e32d4cd1a7371b7a154c8608560a63b1e4fadd7 SHA-256: f543ab60d91bac40abc9a196a518bbce4f31ea69770058096951699d1b44e9bc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kfnmsz.com/upfolder/e/files/20210908195317.pdf In PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/libubukidowurikukutif.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16131f507b9665---posowudepevaduwulibiv.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/55850514915.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/vudogufogelenikov.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/wazuzugilixadisuvejiz.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/pewari.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/8822015758.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/2155763975.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/78832684074.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/34921434030.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/fopaxujoti.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/15594360852.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134e71e7b692---jupabijureb.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161368e9684d76---18716782869.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/62993083179.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/rewejidetisapo.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/62341859696.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/72710064664.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/redavejijo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394d089a7de---55228522132.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/19506406765.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/16994665093.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/fubelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=moses+genealogy+chartPDF 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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 21576 bytes
SHA-256: decf0526686f2db227859a126181c396c3103cf166ca00b6c2ab6fe1146ef98d
font_02_sfnt_off000133aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AA 10524 bytes
SHA-256: 8f0d0040a1794fcc8232d50db1ab8a6e6d5d1bae7b5b46d1155147bab0900141

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