Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41836a0173cb76d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-09 19:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 497e954d0291fdf9ef892cec7e3ac939 SHA-1: 4f03b24d0db5ddbfbb623c3c3e6208139a4e83c1 SHA-256: f41836a0173cb76d49f4131275e1f02d1c7d10343841e80442672dc0c2f07bd1
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=stock+car+racing+android+1 PDF link annotation
    • http://locthanhroyal.com/upload/files/jujoneta.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/12329375817.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/39237074172.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/mapaworivozikapip.pdfIn PDF document text
    • http://lgassociates.in/uploads/77035741865.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/49711633086.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/6405913539.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/12213753899.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/guvikomajami.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/jekave.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/tusolesatezipudim.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/80323581356.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/vimapatujixawolupuvafuk.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/83016427713.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/jowijojuzitilejasexiveke.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/popesorixinibenuvukuviz.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130209bed087---munegakafevenadu.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/bezufadewuxamarifuromelon.pdfIn PDF document text
    • https://adikketiga.com/contents/files/lapogesaxunute.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/pajolomumezugamemawami.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/30250745219.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/74206245370.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139590ceabf1---rofifabanodav.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/7b7622b4b23b0474aa2bff2baee0b805/97106968570.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_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10420 bytes
SHA-256: 0d7dbc65b3f89d5e1a909d1fd4aa9c1214cd0d478cd543b24a9252234ae821ed
font_02_sfnt_off00010f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4F 17488 bytes
SHA-256: eb2d6a6401999578acfbf1715d9c1a154e9b78cfc218b813c558e42fca395eee

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