Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f7993b559a8c42…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 04:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 08df6e69d84e93c9ab0f2aa7284bd0fb SHA-1: bf721b76aa538009a1e9febf0e076d56334c9164 SHA-256: 77f7993b559a8c42fd26d31db44672aa0a9204246cae18b77a9c0b1e1cab1a1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or link-farming scheme. The presence of these links and the overall structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://batikatravels.com/userfiles/file/91081997497.pdf In PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a042a73d00c---turudomotisetezum.pdfIn PDF document text
    • https://angkagenap.com/contents//files/94247969448.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/73103462413.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc6256e5f0---79029166237.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/lomefawa.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/zorusin.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/pejunutitefagum.pdfIn PDF document text
    • https://laser123.com/geektic/files/rutunukifufunukunidojusam.pdfIn PDF document text
    • https://angkagenap.com/contents//files/89877037272.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/93410799089.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609988b943f6a---57123696959.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/52ba9dba4d9cc91cbff440130e33e381/vigerumepevopazupuxeredu.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210821031907.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210719075144.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/215ef1ffe670672593a1ecf4505894ad/jijoxuvatiniwosov.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/kopivugob.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/34845119485.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gipufujumujukediranok.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/leregebufasu.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/mewaramebosox.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/milepugemofedu.pdfIn PDF document text
    • http://4bx.pl/public/file/29882418377.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/477b321950afa997694ba1d6233c1942/tuxuzegezenepoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=convert+pdf+to+jpg+high+resolution+online+freePDF 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_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 10940 bytes
SHA-256: 456e9a5ce5add96cfeb9a3ae86826d3a898719cc426cf1e8b0c26b63aed8812e
font_01_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 18508 bytes
SHA-256: 85a027e1780b4e61e6203b0d70d1990466a442f54127992c2aa7c60a6272698a

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