Malicious PDF — malware analysis report

Static analysis result for SHA-256 caed6eb4336b3e18…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 08:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eb3a93bacbb80a878bde34dcec498068 SHA-1: 171a2da5e67b2f80c9b59765a018212343f5769b SHA-256: caed6eb4336b3e183c0903780a053c93719770e79c701ad36ab659cbd2d5908d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and link farm indicate it's likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f9af7f5cff0dcee536677d89e2054a9/92663197277.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098579dcac42---8713296965.pdfIn PDF document text
    • http://dzbnf.com/upload/file///dutowopisigu.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/17169917133.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7f05afbe2255af1a03e6b33008797bc5/31827018838.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba948866959---gulefukarox.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850d5e9a7c6---15152112471.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/kujidoremodebudapen.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dea4383a633---32796115798.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/82592925335.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608649e341ed8---pedegoniwobebaxilozilojon.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-8/file/2021083107514073499.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088a476020d6---tilefomeba.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8d38d868a6b65bb1c447c14112f55aea/89838659609.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160da06cf6587c---12552939964.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/xiketawiwanesivegabo.pdfIn PDF document text
    • http://biosite.ru/images/news/file/40429640933.pdfIn PDF document text
    • https://mmszke.hu/files/file/78939174913.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72520d4cd---nixajodalodagag.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/79501259412.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ec973a44---74949748816.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/silodiwasidugikivo.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210626_740A43071381CE18.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11338dd28---12338221369.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/97433260874.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///jifefugunujiruwivenaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hotpoint+ariston+aqualtis+aqm8d+49+u+manualePDF 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_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 11244 bytes
SHA-256: 1ac296bc0171a2d90a2c6e7331ff096d303d7f6d435886735b3f920f81b03c20
font_02_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 19956 bytes
SHA-256: 8e8dba56c5f1df9cfa70bb152bfc5e0a18c6bd6e4804d4e58ce102f155f94188

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