Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0832649373b50ef…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 02:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e7b16fc992c7d7598b9f2d4f22c6ac8 SHA-1: 1d71c31285fc69ab04ade0088dc78da1eeb97881 SHA-256: a0832649373b50efcdbff06bc46a510c3a9cbcd934d45f8fce0a6f68fbb42428
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple URLs pointing to compromised websites, indicating a malicious intent to redirect users. The presence of a link farm on disposable hosting and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laxycoffee.com/upload/files/ganizotifew.pdf In PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/9067158096.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/38676264096.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137861527d66---2175176905.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2eaaa5af---salag.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/ragexi.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/79546406169.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/nosipura.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/11891453693.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/26671179074.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/26597684539.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/jujiregamibasazefojud.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83602579592.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/40830958604.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/57248690037.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m6r0lee9bn78dtb99a5s37en8j/naniburofej.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/34795668973.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/66320333256.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/43356185750.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/wigabumawoporug.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/fowolanonivakipulageg.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/jobuperikakewivimexafuma.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/86766138807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stream+mobile+phone+to+pcPDF 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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 10688 bytes
SHA-256: f7129b02ce2e6829492c1c8e8f4110ccec4a1b00412fbafd1a437734cc778aaa
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 18008 bytes
SHA-256: 53732d4af9c927ebd6ebf6841f9f78054098ab692fc5e723a7b4a0d8ad7156f6