Malicious PDF — malware analysis report

Static analysis result for SHA-256 9047f2c3b74b92dd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 00:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90fdfcf20f6a1f558022b6e57954eaa6 SHA-1: 59d9eeecee8bf2a7a8b0e9eeb06c0ce3a63bf8c1 SHA-256: 9047f2c3b74b92dd665814f8003f3fe03f6ed2e63e61d97a53b2a96d74944405
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=call+recording+app+best PDF link annotation
    • https://imad0c0.com/js/ckfinder/userfiles/files/muwexa.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/12866130513.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/labofeju.pdfIn PDF document text
    • http://bndweb.nl/upload/files/26978470642.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0224555e---98382904322.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/zixuzigonifafajo.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/pedibabujejudawanodez.pdfIn PDF document text
    • https://bczenekar.hu/files/file/33530028129.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/94897299974.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/90987668117.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/sokute.pdfIn PDF document text
    • https://datajournonepal.org/files/22367345028.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/93166117192.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/36433478664.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/98154474947.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/16a772387a3056e70eae0b7e684c4a37/69815282455.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/pubiwavuxulibigitaliwimar.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3fc37efa---dimarex.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/madepiw.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/kowofugarokiwowasab.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/fesaxalukadajavu.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/38828596450.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/m6kb2racf8aqivp88j6fak13k3/bavibazo.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/42419326432.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/12127258289.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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 10860 bytes
SHA-256: 4c927cb448593bbe1c8fa7ad5be46558ba30cf4a1e9636b75fabcf4b2ecc7b70
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 17032 bytes
SHA-256: 37d6d27d00cfa741905937641c628291f25c33a188b9504f88e23bc1c73419f5
font_02_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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