Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ad41eeb85c3e6a…

MALICIOUS

PDF

80.1 KB Created: 2021-08-14 11:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce8ee612a91c54e7b485f550f7130b4d SHA-1: 5222139b8023472d8c9296f144ce52f27fad5708 SHA-256: f5ad41eeb85c3e6abe7bd867622cc39df6705c905dbf6da4bce3343b70a70037
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS upload directories or are part of a link farm. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further compromise or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vivatbacchus.hu/files/file/9762573327.pdf In PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/lekiriretataji.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/ladanajirogezuzerunizu.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0521c5bf5---tomalemulefisorurof.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/977a6f114ff9dd50ba548e6b17335902/51165568335.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/zupedake.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/36697361757.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/dikojumujitufokujetaw.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/xepukebo.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4bc9141de863a6b4702902d621af6f1a/wafosudiligalevox.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h7sjah4sss649b6ugvsgalqq73/piwukomalotegoxupedon.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e87a6ad071fd5298a6999a4cea398a30/tapunolowuxoromatotok.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/pinotolisupojolirut.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/seninezug.pdfIn PDF document text
    • https://ebooksweb.net/files/file/14970211918.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831e030b23---25544373110.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5722193177.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wamugus.pdfIn PDF document text
    • http://yilip.net/userData/board/file/35774153404.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/bulesuromanamutiwubipuvi.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/bebomovuvumaxajusajanat.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/85215820321.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/rabote.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/20963326759.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160eca127cef97---kowewagudijuni.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160f2ba9f638bd---6846417929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=te+presento+a+laura+pelicula+completa+online+pelisplusPDF 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_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 17180 bytes
SHA-256: 8a50ca97081226f17a910604e71867c5f976d50532a2a17f618729926488aaf6
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10600 bytes
SHA-256: 5e1fc7b87f4b6c2a0f1f85bcdbe2cbfc09ba0aaf6e819405227b702b1caa38e2
font_02_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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