Malicious PDF — malware analysis report

Static analysis result for SHA-256 311f30ff9455a957…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 06:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54d5b59ca25152cd8adefcb878a47b35 SHA-1: 24cc9d9554d5fd0026ac12162bffc81260b7fa58 SHA-256: 311f30ff9455a95787818abb23b42664294cb4e257c9f9c36eb3d9ae5d53772e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content, while the link farm serves as a lure to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laborke.ru/uplcv?utm_term=crazy+rich+asians+123 PDF link annotation
    • http://encino.ilovepokebar.com/uploads/files/41238218056.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/de498b3889567ad814b09e830f7f946b/52935966172.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/dasex.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/3721918499.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/37276868587.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/49387807000.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/30624127580.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16137750584f26---lomiv.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/68971022474.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-06-02-07-11-81.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/36167340062.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161344dccc79b1---41867157938.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/pubexade.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/7100652544.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/nesewiruvekofowujijivex.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zoneleveli.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/36079319675.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/jozevazatemiguxedu.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xozubu.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/dorotewaruganedipuso.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/24777772362.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_off0000bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE7 16620 bytes
SHA-256: ca1ba944609e364c05230a5917ed79a113588d3ecefd2df016f477160bbd1717
font_01_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 10480 bytes
SHA-256: a1b305988ea3edca6f5421126244afde14c180a456e9fa0a9cf9d990084d5641
font_02_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1