Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d447a1029da065f…

MALICIOUS

PDF

79.4 KB Created: 2021-08-28 16:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d50dc199cd023fbbc60e87e7b1bc3517 SHA-1: a51595c7e0c09ab15a0c66349f0afe6a8cf37b32 SHA-256: 1d447a1029da065f64aca7c47468ea02514fe717674322febe1532a9553b4e74
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, distributing links across multiple domains, some of which are hosted on compromised CMS uploads. The presence of numerous links and the use of disposable hosting suggest an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://mellorymotors.ru/admin/ckfinder/userfiles/files/60607738314.pdf In PDF document text
    • https://butchercurnow.com/img/shop//contents/45347657378.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710930658a7---gevasikoj.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/98994770785.pdfIn PDF document text
    • http://belv.ru/userfiles/file/69427033553.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c961d6687f---43699402950.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/tizemasewimofajejoliv.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/omgnh689su45uvop69i83ukle3/78814903111.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/palivadag.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/63949859649.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/398b8db53c427d14992eba0a72a9de4d/mumuzagexoperisoruwek.pdfIn PDF document text
    • https://mszukam.pl/dat//file/76432701964.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c150d44bb11---34871299637.pdfIn PDF document text
    • https://tonitomov.com/picture/file/gorejuxowoparenoranil.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sukobalagake.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/mamaxatu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097176a6791a---pudapirekatefi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd0b50e32---22328613067.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/lesuref.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd15e098b---xuxuforapixatupep.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/78304558929.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/75201958173.pdfIn PDF document text
    • https://activepymes.com/pub/file/kotogukifefadale.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/giwidevajagalijekurij.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/sclcv9edg4kufhrupeu8m0olru/97166732412.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071960620915---kudikijorera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=prince+andrew+duke+of+york+and+jeffrey+epsteinPDF 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_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 18016 bytes
SHA-256: e315b7504865224b145dfa0e2c3b905953b4be27cb8aab54c9ce7ece3a6f21c7
font_01_sfnt_off0000fe58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 11092 bytes
SHA-256: a6d1b1c356ea81b6dbbf7e5812a9bee98effb3461f72498d52471a0792dbd90d