Malicious PDF — malware analysis report

Static analysis result for SHA-256 611a96ad2477858b…

MALICIOUS

PDF

82.2 KB Created: 2021-07-24 20:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04beda83f10558273c32c788000754b5 SHA-1: 3384eafaca5681de4ac915146a22c599175e0ed9 SHA-256: 611a96ad2477858bf344de4d438ad686b651468bffa30a6577477d5cadd5b2df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://saatyapi.com/upload/ckfinder/files/18849636768.pdf
    • https://pelletier-tp.fr/ckfinder/userfiles/files/82835130172.pdf
    • http://sl-light.ru/design/img/upload/file/13983653332.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1069bff2c---nugikatibewoj.pdf
    • http://soupworld.de/upload/file/3774413840.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a5b55290d---73583738877.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a948e91d35b---xakuraniwiwupagagijeda.pdf
    • https://stillwaiting.org/userfiles/file/61600796401.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/05a757760385aefdc58b3e3d9eb2a7a6/nevado.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160715cee2feff---bafuzogap.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/kozopowupozubolis.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab688cb06ab---10789519694.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e71aafd2b9e---nojupelazosuz.pdf
    • http://nuraski.pl/wsg/userfiles/29425308612.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9e5e79afbd03cd92ee2d9d823cd2ef48/bopokodotulafisa.pdf
    • https://sardavetri.it/userfiles/file/50632645036.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/3835353160.pdf
    • https://cafesca.org/ckfinder/userfiles/files/29517650970.pdf
    • http://microsolder.hu/userfiles/files/vuxumeda.pdf
    • https://swalaya.in/userfiles/file/sagojixilovaf.pdf
    • https://coolinterier.sk/upload/files/24176210369.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/954fb9d641976212480fbcc0f6f23d68/dadojesu.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c975e69ef0---jujezumavizuvusa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=imagenes+para+pintar+de+princesa+sofia
    • 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_off0000dbc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 16792 bytes
font_01_sfnt_off0000f3e0.bin
37a041b57322b8b6e3ba55a378f9b7c0dea0fdf0cf6a1854b5a1c040afbaa796
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10868 bytes
font_02_sfnt_off00010cbb.bin
f60ee6f6c3c8ffa3858c44495ed6e159bca948cf2d03bb3610c82691818acc56
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 17684 bytes