Malicious PDF — malware analysis report

Static analysis result for SHA-256 88dbf9737ed2af4f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 15:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52bae400e488ac11fceb62467071b17e SHA-1: 01fafbdd8de993817f4e0cb62ae77b3c6b45d69d SHA-256: 88dbf9737ed2af4f32c1a08b57d484dc35c8fa77e9386676ca42cac959556762
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting. These links likely serve to distribute further malicious content, such as phishing pages or additional malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b55cca4c89---zewiborutizumojivekofem.pdf
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/fuxojotogamifo.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/smilck3ru4k66apid7ptomtp15/kigefeganovitawijufi.pdf
    • https://twr1115.net/files/fckeditor/file/dutuwuzoxesil.pdf
    • http://budoprojekt.eu/obrazy/file/rovusaju.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cf364vnmrcjj1tpqf0l31g2ri4/mulotonanuj.pdf
    • https://oxfordjsr.com/userfiles/file/bokitaxeni.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e82e56c3e4---61937465865.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/39995607118.pdf
    • http://najlepsietorty.sk/uploads/fck/file/gipedewadudelipulox.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acb54a810---bujexodi.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d80a323352---gusumejefi.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e65b02838ad7c1f40a1a362fc04386cc/1200864042.pdf
    • https://gotamsui.com/ck_imgs/files/87788021707.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2a16846b581ddaeadbd8d3f6748f134a/zusinuveraruxiridesoxo.pdf
    • http://medicaldistri.com/ckfinder_files/files/tokuv.pdf
    • http://plise.org/userfiles/file/71917575140.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/evsboeeqmh8c8t3bo61b2kej6r/78164601584.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b2a7168d1---pujisuxibozizobupera.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/25229233649.pdf
    • http://deccanquest.com/konadnew/userfiles/file/pobalakaxaderila.pdf
    • https://alianzatours.com/imagenes/file/88903416371.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d457b58a3e---javup.pdf
    • http://allprintusa.com/admin/images/file/45824508155.pdf
    • https://asiarsolutions.com/userfiles/file/14715205407.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=inch+to+cm+conversion+table+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaca.bin
235ec8c7119e6330b2b30da7d400b02d7ecfc82b64f2f4cd8cc622507cbf119e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 11044 bytes
font_01_sfnt_off0001040e.bin
4f0fef0a80a158a8c75eda61fabdd303132a5b34b7d7a86f8b00d2ed5be2c24e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16588 bytes
font_02_sfnt_off00012e87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 16792 bytes