Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bb2b4b77752025…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 15:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9340fb64a5a626b6bf1f535d0d596d84 SHA-1: 7d08a07e059b6cb7e2753ba2ca4a7f400b7b4985 SHA-256: f4bb2b4b7775202559d95feca9ecc79d03d48f08ddf740792658e1d3ee5883c2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.eos.org.eg/ckfinder/userfiles/files/situteligutewuwabodipovu.pdf In PDF document text
    • http://vswet.ru/f/60272054599.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/cd372743d71241c2fc7fe02c9739cc78/91206289218.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/xetomawibuvejinid.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0a339834---97251487288.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/regavi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353af4888b3.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210905103328.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/sosikapozenedejo.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/xeruwevawililodenefezuje.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/difuwozateli.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/99043995082.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/xoruwal.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/masen.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090217082456.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/89300522628.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/kavapibawu.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ludagupuwunolanovetumo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613093c77e2c2---54963507263.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613886d4c1c57---18135931107.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/24315911017.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sejotogerobenodilubivevu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab07cdd368---86689861331.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/bobusu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bf3037cd---sojuzedepegeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=game+of+life+instructions+pdfPDF 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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 10920 bytes
SHA-256: 1d5f8816bb8b2b4d6672b386ddea10db4121ab45531f517380b4f713244b8356
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 18000 bytes
SHA-256: f79ea37c93c74e9f260911720172045a2a00bb30bafb27d2eb33e3e3fd7d1836
font_02_sfnt_off00012c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1