Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbb11c23d857f10…

MALICIOUS

PDF

82.0 KB Created: 2021-10-10 05:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 411eb2c011a4ddb77b9ad87c49d18bec SHA-1: c98808727ea7153124796443adbc50829ae1d7b1 SHA-256: 9cbb11c23d857f10985ce51ea33f8c09cba4af1cf1c24b40cccf5602b369766d
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests an attempt to leverage these for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://uhorder.com/upload/files/pubenod.pdf In PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614fce2873ac7---bugipujus.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714aae5092---58191490611.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/11083849749.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/79563418482.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/walifosunip.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/19023364972.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1hqcfh6ftb7moui8mb8ngg0ia6/94876166831.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615ae502ebeaf---toziwawelorif.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/12667660789.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/40340966612.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/moxol.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/fagumizilisuxegew.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615fed3a4b248---ravenegegovefunoti.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/wewijedagenuxogifa.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f9ceb58d2ae07fc33566a0d99079b44b/12321255542.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/xukuma.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/74561456165.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1615749047baa1---tamejide.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133716a000b9---78645252236.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/73023125418.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/70831162367.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/5la7foo54ml72mttu4jt281t9i0u475i/70788045925.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/bemokekinokilikenawojiw.pdfIn PDF document text
    • http://stw-nowogard.pl/download/file/dekiditefakef.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210916002713.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161320de36ceb5---ximopitopurokev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=conjuring+movie+download+isaiminiPDF 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_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 17488 bytes
SHA-256: fe2065f0a3160c042063b214e5d1f8aa2a2eda7cf1dbe8399a7f16257d620b84
font_01_sfnt_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 10908 bytes
SHA-256: b086d61128e95d48cbb7e4d135ec8dc8253a41d73183648eeda9b315f611403f
font_02_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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