Malicious PDF — malware analysis report

Static analysis result for SHA-256 73afe6ff4157b341…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 13:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18f2e21cc4cacf115074f6ec94c454fc SHA-1: 0c220fbf2e24cb3f051f0991eb561c03078c58a3 SHA-256: 73afe6ff4157b341544b3ff4a0fbd9e43786b7e6bd50661423247e17014f7541
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous disposable domains and compromised CMS uploads, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or exploitation. The presence of multiple external URIs and a link farm heuristic suggests the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=simple+linear+patterns+worksheets PDF link annotation
    • http://birnagarcollege.in/userfiles/file/xotedozujufavida.pdfIn PDF document text
    • http://berbun.com/user_img/file/34938562074.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/mogusivitalixumivafab.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/dfd80a022aa5609141da6cfb48677584/28986736531.pdfIn PDF document text
    • http://ccsl.asia/files/67991399174.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/webefidoxatewi.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160721daf171d7---67331761015.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aac125f0d---zabadaxedake.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161133cbe933a2---fepibixirawopil.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/769b3a3a821215d79b19ee1f9a8eec6e/xikafagenotuzug.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/kubiwap.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/15950628262.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/73232294650.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/nazosuto.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/52248242827.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/68b09e4e3d4aa51f91942934abcce083/66458905458.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92d9c6e55c---33122471001.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/zefenefor.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/96451124168.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/degituva.pdfIn PDF document text
    • http://raczcsalad.hu/files/zipalinijenukapufafi.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0416d4d00e---25709291424.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_off0000d1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 16556 bytes
SHA-256: 6fc75b9a82ca196fb6ba35378a512ae96c6b4c2d8d489022accbca87b137007f
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11512 10768 bytes
SHA-256: 0a56989958d4677cd3dba65291fd59c55fb5954f5438ab2a6b943c7ad0ce6d61

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