Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bed35fa5c46b7c8…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 06:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c32beb06a408b39c2f5f8da03d81a103 SHA-1: 304e97ea1e82adee7a325b786e96ee41f1a1f9cc SHA-256: 6bed35fa5c46b7c87fe1342913fcba4c8771bb272bdceea44178a57d6039bb1b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. The primary attack pattern involves directing users to these external sites, likely for further malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pixomot.ru/uplcv?utm_term=castle+crush+hack+download+2020 PDF link annotation
    • http://mrs-edu.com/sribati/editor/uploadfiles/36493257101.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/dajifiratovatevewejigap.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4f0f328e8---gulakimuwebebimi.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/9680668587.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/notadijolukodi.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/bowafekejenejevovemuzu.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/53600236348.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/kuwuzumigesezukoda.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/jowag.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/37478974296.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/temofexobu.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/60821949454.pdfIn PDF document text
    • http://lighthouse-connection.at/myPix/file/29403043162.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133416e473b1---97835748979.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/denibisip.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/50540088728.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/20481149665.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/17364688198.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/95e06ab24f4c17c2407a790e4fde17b8/84825112778.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/90354086247.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/relekalugumefisavit.pdfIn PDF document text
    • http://lejuriste.ru/files/file/4187255128.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_off0000c1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 10924 bytes
SHA-256: 6d26a3ee4e1638bbe1e885f6f7426af696070a12a992feea262a68b0ac22df94
font_02_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 18300 bytes
SHA-256: 8b745856172996f8c4d713c257cf687162859244c48ed9509fdf91e84770be46