Malicious PDF — malware analysis report

Static analysis result for SHA-256 573c92bbd8709fbd…

MALICIOUS

PDF

73.3 KB Created: 2021-09-24 22:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c95a23514f905c4baf70bf009380bf6e SHA-1: dc58a42b18190e8a0ea46292702e2e7b48fc8400 SHA-256: 573c92bbd8709fbdf5cacdb6cc900b0af34268a8828fba6324978992e880ca23
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for SEO manipulation or traffic redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • 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://quatangsongvan.com/hinhanh_fckeditor/file/90611374069.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7d37186ae---65232361381.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/togadole.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613690cf6c30d---93809816605.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/bizifazegexi.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091913161273499.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614569ee3d30e---jufaped.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/13054625313.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d054630a---femebim.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/07tn7qk33ktr2dl4cfkhklg9j9/najifawetigikubolewor.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/duxidokiwizubedatobiworo.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/pegukezago.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/bufiginoviguwedakagane.pdfIn PDF document text
    • https://ksboutlet.com/file/files/62417197433.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/sevej.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/kuzelebirivemogukesiw.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/kirazosenusupusi.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4149345610.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/23890856193.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/4536399961.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/roreniro.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/zawaf.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/tozipatubatodaxuraredafov.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sipikenavelu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/m9dgj95e59dmoso325gis3124c/xomonitozuguzeboxefe.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/libuximagekugagut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=piclab+guitar+apkPDF 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_off0000b76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 10360 bytes
SHA-256: 95150a98348709d9b235a5b617fa481550939a00307575e21774ceb6ce75f20e
font_02_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 18916 bytes
SHA-256: 1451eaf6f45678efd0424c044e86daab3a902e4044c8b756eccb7ac11cee524a

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