Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc96e931bd29e7c…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 12:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 12b23e767514420e94e17bd2c4a18c65 SHA-1: c14c83193be19161606325f1851a97f2f4663781 SHA-256: 8fc96e931bd29e7c7503a2094e582d224ba983e61e083125e1c1df80bd8db04c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://liderzy.natura2000.pl/imgturysta/files/sezugakedikukerape.pdf In PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/86531827600.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/72139304720.pdfIn PDF document text
    • https://clubselect.ro/ckfinder/userfiles/files/48510889186.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/1273403996.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/bp7er7pi5gmt6jokf8fd722mp2/46685437747.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16147deb829e4e---lebupigomerivat.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161458dec38719---83612240102.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/26059053594.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/javopo.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/viwumilufegikema.pdfIn PDF document text
    • http://ruihuitax.com/files/file/51124291453.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109090924298403.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sebezopiwu.pdfIn PDF document text
    • https://kham.vn/userfiles/file/dibanowexafopipisi.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/bonijolilevobivipabi.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/90605467432.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210914053750.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a145d4aa58---wafefamuwezebemo.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/gunasejimi.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/82814762393.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210921_195344.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/redixozatekavep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+bloody+platinum+cheat+codesPDF 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_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 14672 bytes
SHA-256: 3bf00bd63bb0215bb651e851d92c58ee16aef6edf95a0d1a14bdd5ecdae4a881
font_02_sfnt_off0000ea54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA54 11128 bytes
SHA-256: 0163608e2e24954d294b80564c5d039e7952c68f359d7a1c25a389f9e363a3bf