Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb9d10239b4243c…

MALICIOUS

PDF

90.4 KB Created: 2021-09-06 13:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14245c61e21a6c90c73d1d7d5fc047dd SHA-1: 065ae7771a996adaf177cdda04d5a35f0cefa93b SHA-256: 6bb9d10239b4243cb2b35292f6275fb75f984cefcdaadbbbb4cdf08b01cfdb1b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farm patterns indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://censcakmu.org/board/file/files/ruxolemejesezunufobinan.pdf In PDF document text
    • http://jonme.net/ckupload/files/68871372311.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/62361226916.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202108131747268272.pdfIn PDF document text
    • http://etre-belle.su/images/file/lazowun.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/916d0c5b4ac5d0a9ed17481f22916cb7/5798185096.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/bowebolexulavabev.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec1ee8fe4---27127357437.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/didopepiwenodet.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/jijopikaredutino.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6a4bae97---fumuvivodopopabap.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/dinetutexemifidetimutasog.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/vtueedm6es383b9ei1bca47qmc/fajedekejafisakozogin.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62b45e9ea---topuniwivexixaridetum.pdfIn PDF document text
    • http://babamoleskine.com/files/file/85445561499.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/32629034490.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/17468964930.pdfIn PDF document text
    • https://petala.gr/userfiles/file/35720018456.pdfIn PDF document text
    • https://ksboutlet.com/file/files/vujemon.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/lewewiwen.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/58292624994.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f8cb47dabdc43eae6b85dab885b5798e/79076301637.pdfIn PDF document text
    • http://blatt-gruen.ch/files/96048707558.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2b16f53ac29cfcc1742d3e52720dc490/83309040149.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/nefojuzodosumidurekoraros.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/58191747955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rehraas+sahib+path+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_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 21088 bytes
SHA-256: 8612c7bdc276e27c97c1699dcbb07cb497111acb87582ea5444f8f12a8706cdf
font_02_sfnt_off0001442f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442F 10512 bytes
SHA-256: d3d03bd6f3b00d6a94b35bebf8074b64e8ffc99e8a76cca227edacdb7b2a9b22

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