Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa458cad2f837c2b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 03:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 356077ec049ac00afd18154d126fa90e SHA-1: ff71872226cd5e68cde2eee34691f98055998e55 SHA-256: fa458cad2f837c2b62c2f6d8e2540bbbd886d95a517bf8823301a20a20cfb514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF structure indicate a likely attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://toppelletmachine.com/d/files/79869028432.pdf In PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/lepaxexagoke.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/5669107873.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c4ac0133c9b88c290eb0becad8ff0f7c/nadexexokajuma.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///kefulibakuganuvet.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/90187283356.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/s4cq6nocpe5c0n7qt6bnd8qvma/tamivirojafasabirugize.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0c374da38f391ad8e274990ad6c2acfe/tokuvixolanivawirupetefo.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/25039422446.pdfIn PDF document text
    • https://atl-50.com/files/file/34325577979.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/69000174546.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/xaratewuxegitokuzixoxap.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a7f220293a51dd0bf02b1b567056a780/pigimogubakigab.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90d4c2487---38468965565.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/dusegopodipiliv.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/11450298201.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/fuv5afgkepfpe2emt91thenhnm/74943315533.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3004bd94d---dovumisedepuwizodenewu.pdfIn PDF document text
    • https://aokman-drive.com/d/files/wivixigu.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/wotusanojezorona.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a45ef08e4ec---55411850757.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/bizonoso.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/64275366508.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8d53e765a808b6c5e39626090ae6e25a/13282500757.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/35254358571.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/13515177409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convert+pdf+into+english+languagePDF 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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 18268 bytes
SHA-256: cf2bca713352172956c83414e5b24e21b95702ccc2c5c237017037cf553ee522
font_02_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10972 bytes
SHA-256: fb6a51eee3cdba13046aab246f66d55530896e64e243aeb1e0568b7693b9c47c

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