Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba63ea1181213a86…

MALICIOUS

PDF

73.1 KB Created: 2021-06-30 18:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 49050d0d8fab6b6fa1f29a3b1fe68cd8 SHA-1: 69d77d3658973f6d736d808483e6b9cd287610c8 SHA-256: ba63ea1181213a86a0dc8e5aff19848a84feeffccd0f4aaa10686707ecf4f0b0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination or leverage existing infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=tralieve+for+cats PDF link annotation
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/fb1783e6fb6bb35bc29d57c2c379acb1/24266497433.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9f08f2a09012ad028c029667a8ea18e0/28616482020.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/18295552251.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a248b4bc44---39892063542.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef8ed063a4---robiworewe.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/eieriq9nj65i69krv57pfh105j/52056879009.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/63697269030.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210630065853.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb039a2bbc3---gutazenax.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae6a3ad08a---radikutapowofopijimawagi.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/varejaja.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/zebiwovug.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075510f067b9---nisakujogesowixaxar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f9398ea18---35881580101.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/faxevunuxenoxigupexuf.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160790a1fd97c3---73254484811.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/35657345168.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/24056145011.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb1db22c40---romavugotofid.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/23410763993.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/40488946358.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078d70d43a62---24745834633.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608939d561f6d---53823719521.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0599cdf983---39205664273.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_off0000bf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF37 15856 bytes
SHA-256: 208dc7b8b87f59034d7337f9763c1e2603bd857f6f15bc4fd9d41ba0939383bf
font_01_sfnt_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 10256 bytes
SHA-256: 8148a41a09840ae27610c8ddf5e62583efa10c23cd67a425e7417c97f5a6b1d2
font_02_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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