Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4969c6a565e766…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 14:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5507aaf95b524838edc4f4d798861d1e SHA-1: 59fe4a3c9ff76d29fb085c08ad6216244093f504 SHA-256: 6b4969c6a565e76695614f9508b52a21a8b90edb1a51404c699ce5d154756a72
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to manipulate search engine results or distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://handbook.hu/upload/page/file/mekiwejubiwa.pdf In PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/95325003432.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/96837939732.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cec8208b6e---wakirotelavuwalako.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/vikixajududobugowoben.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/98386664668.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/70092245711.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d831105cc2c93bbe614c675a2d2726a7/jiponolo.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///penuxotamitikodetozas.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/fd7bf6727858d38b390ae6c1cee390e7/nivuzorumape.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/45175524321.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/11886720598.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789d96d7f19---nubamitedelugeziju.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/fevifetepazuxe.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/wijujowip.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/lewen.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u1iu26j7jc072vo5m079thofb8/21222343347.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de660ab7a5---saferutuwox.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/34164282752.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078b16527ed2---51744014382.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c582e440006---doxakenulibomozababafix.pdfIn PDF document text
    • http://geose.ru/userfiles/file/monuvosuzekeva.pdfIn PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/pejux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=percentage+abundance+of+isotopes+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_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 17952 bytes
SHA-256: 6d469caf0560eeead08723be61b720183d0e25cf99a7a6eeca1fe29b2eb9004b
font_02_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 10992 bytes
SHA-256: 4178b4fe12ec6a18d261d1280546590257ce164cded5d8bd3e091862b374aab9

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