Malicious PDF — malware analysis report

Static analysis result for SHA-256 9977f8f9ca72e22c…

MALICIOUS

PDF

77.0 KB Created: 2021-06-26 00:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60d1dec28cc06cab97f1e60650ce3fde SHA-1: 2ca60d6e905920db868ea5e3a0123ebb7fa0897c SHA-256: 9977f8f9ca72e22cdcfbc32f366e8a100e8bfbb4c29b379157ccaf42d35cd39b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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, directing users to multiple external websites, some hosted on compromised CMS uploads. The primary purpose appears to be redirecting users to potentially malicious or phishing content, leveraging SEO tactics with terms like 'functions iit jee notes pdf'. No scripts were extracted, but the PDF structure itself is designed to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=functions+iit+jee+notes+pdf
    • http://sjhrz.com/images/upload/File/42444609946.pdf
    • http://caphegiabao.com/upload/fck/file/75861286936.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b0fad83f4---43173911663.pdf
    • http://startmatbaa.com/userfiles/file/50988972866.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1376deabdb---wanadavepowe.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cdff018df81ebe5a1f3b77fdeecad740/fudenapabakosojogupotexuz.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b0356150a---10919222678.pdf
    • http://jjmcp.jp/userfiles/Image/file/takisukogijuravosapadese.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a56f70379---67658771782.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080213096115---wijurope.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160744a3a61e1d---37787031635.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7c2a8e560---99038050638.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/46f5aecb67adb5192b2d5775d3476b1e/49115792217.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/27ce10408530fc000cff3b9129ceb68a/94404704603.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ecb8tqjdrha3kae449krlvo530/zupebipufo.pdf
    • http://alphasigmaoverseas.com/userfiles/file/mesivukibuterosutofugazeg.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a948cb2a8c3---87332074197.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8ac41f982---fogifolonozapukosa.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/367b22887232c393c0b7cae2df2bbaa3/sowikim.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fdcb7729---zukonivabusin.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1eba06d61---37040419966.pdf
    • http://seoulgreeter.com/userData/board/file/66487635897.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_off0000cb94.bin
853c3683dc5903e7360c2980cd00ca0f8e9ac737081dae425790077a70e7b5e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 16572 bytes
font_01_sfnt_off0000f6c3.bin
a582848fcf367df928ad219b8bc62dc683f1e0f6d7aa0664f3ffd949411c23a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 10512 bytes
font_02_sfnt_off00010ec7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.