Malicious PDF — malware analysis report

Static analysis result for SHA-256 6879fe8bbf6de99d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 10:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2b971eff9d4c74c2d6131108802ebc55 SHA-1: f53f94a9a3d8e1b8f91c4eeecfed464d5d13af75 SHA-256: 6879fe8bbf6de99df62c434b96e7e9d1c0f07d8b9e29010ab74980cbf65502aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads, with numerous distinct hosts and URLs. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/3f190bf334dc3e0c317c06ca654a00ef/befomajafafabikivawaduja.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c664e6121ea---nupelete.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609495a9aae3a---80684978712.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/87692406515.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210709115512.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/niguvikelidimojuw.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/danodefisogawe.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/52072158542.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b23d6ec69c---89403434580.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/jusalobunovinizapideguma.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/17474322146.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/36308aeed5ca79f5021ae202a1ae1ec6/motumusokukakatedavadega.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/71235249548.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/spv6u75fcci23asakhrbmcteg8/90233524703.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2952a6625c---rezuzavewavoxepo.pdfIn PDF document text
    • http://cx-gl.hu/images/files/jijofelibaxum.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/tuzisu.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7dc3413e1a11a15cf23ff195e8a217f8/giniganebonati.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d84b5f6e---rurix.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/65514259152.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a79fe2f0870---pafilel.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/tadikazupusugewofalub.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/joxegaze.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/vtijk3masgo8csme8mmouovh04/minafoxujulop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=correlation+and+regression+meaningPDF 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_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10620 bytes
SHA-256: 132961b03be81ef1634e914a027f69d82fd8f7258fa10d4c07afe108b166d1e1
font_02_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 18888 bytes
SHA-256: e7e9d9152207bff4de6c0003dc044de953d239c140b22c83a140ca48cbef55e5