Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f76a376a9adf7d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 21:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e48acd7d41a83834454cf587087780b7 SHA-1: 6fa1b4fa14686a4d297957a93768795af7309631 SHA-256: b4f76a376a9adf7da40c4382130568ea6992d99d592edda42cd051f11b65eb1c
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. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

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 https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ecb6b83e051cd815407acf5ea74cbc00/walelixaroluligik.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167fda3316---naxofu.pdfIn PDF document text
    • http://cwesp.biz/upload/file/zekixijeverow.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/214767241.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840e2293c8a---lapanemi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be80499168b---22386873777.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210828151417_50228417.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/10936334659.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/54083051967.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/lixesesobomemuxu.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/16354097945.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103b889c0e9c---sezuleligupizireku.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d61e2f6f815---55565158579.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/bevevizovug.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/a3enitpt13klonfk1esb9ngb33/nizadusularuwi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rkg2cnhneo4fq1v6f8e00ooco9/88769685241.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c332a9826---xexopufudaxuzosupa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f5d9a7c1c---lobozu.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/65280304381.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/gowesutadepumifaxog.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/97600222673.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcd0ea74f---mevilepibipav.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-8-24/20210824214315272018.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/napoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=elegoo+uno+r3+ultimate+starter+kit+pdfPDF 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_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 11188 bytes
SHA-256: 6492b33c856f2b794d47be9e29725a2bf8365ad913edabb398d234157771c7df
font_01_sfnt_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 16776 bytes
SHA-256: 6018c22c67f0d4432a2fb6df81e6656ff261ca9663e64ef2160531c94ddb4663