Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb395302fa10b22d…

MALICIOUS

PDF

73.8 KB Created: 2021-09-24 08:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6d42e1fddc0ddd5f8d49d475659bb677 SHA-1: c94b5ea236ee4731143da6c59f5da0911f5f2c33 SHA-256: eb395302fa10b22de49db87c2fc852d0c8c8cde2a9d513941c980276011b1fcd
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains identified as disposable hosting or potentially compromised CMS uploads. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to lure users to malicious sites via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://magerp.org/upload/files/24120680067.pdf In PDF document text
    • http://hybsch.it/upload/file/nutaganatawosixuzibewi.pdfIn PDF document text
    • https://sanidom.pl/img/file/83725661090.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/juterabigezufuka.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460b6606548---66002156128.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/bdc8683a927e85fa908b972c0db65b6a/wujidu.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/56780745649.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/vewexovesu.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/19625160258.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/xejexagafa.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ii0d5rin45bbmhru8nk4c1bbc5/84310680802.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/84320170084.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/82882557043.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6134AA1665563.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/12844231856.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/fodetudazuzunin.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/62607437365.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/xinaposamejatajebewogat.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1715011ea---rugigaluxutisidebezepun.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/29071909880.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/sumexaf.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c51adaa059---44860872734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=jj+script+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/89c05f2d010f4b505884db40a8ded957/8028826593.pdfIn PDF document text
    • 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_off0000bf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3E 16916 bytes
SHA-256: 175edd63eb94ef796659e51de560ac809bcbd83986a33d5ac34cb2c99578e1b7
font_01_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 10180 bytes
SHA-256: 91680e2f0c66c213e627c93f103f663d699c20f85f436784e68d206ea1bfbb50
font_02_sfnt_off000101f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1