Malicious PDF — malware analysis report

Static analysis result for SHA-256 561e7b81a36e3ccb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 04:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92eff9ea331b8b22675597c462529c5c SHA-1: fd51b5f2b1bc8fa5b10825b14aea2c24e923dc0f SHA-256: 561e7b81a36e3ccb8d03f9179f0e70513017362753ebdb70dae32ea05f731f40
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and exhibits characteristics of a link farm, directing users to multiple external websites. Several heuristics indicate the PDF contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=best+android+ringtone+apps PDF link annotation
    • https://kenkochaya.com/user_data/ckfinder/files/podefazorogupoli.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/kipinalobimoxojuzajuma.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613865f34e885---40967823570.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b82d25a66---xukosukuzovulegat.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/028td6r43qbpj8m4btb8te3fj1/nufonewosapamoredolujina.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/vubat.pdfIn PDF document text
    • http://kaies.cn/upfiles/210921054509686258psa5xy.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/tafitelujuxofipolivolivu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e06a1acd---1944028806.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/75966815a5eba18ed5bae29d1cf9ae64/xoditu.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/pubiwazekelukide.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/jixixibo.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144d5b8c8af0---nigakulumeler.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/modezabozisalakewaruvixo.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/91257748707.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/7853732.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091221345377.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zunobowosafedokivola.pdfIn PDF document text
    • https://kaparatt.com/images/File/lomavobilumosojamazamibo.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/42370029601.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/denemifetipasusiguwi.pdfIn PDF document text
    • http://liily.jp/upload/file/20210906125707.pdfIn PDF document text
    • http://hopkim.vn/upload/files/37518805359.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/67807033179.pdfIn PDF document text
    • http://sooclose.eu/upload/File/razobezinezuz.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10463 17640 bytes
SHA-256: efa0d54afc186c2728a268cb980eef2965903e16c1f8256cbfa8ba4808ca4c38