Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaefcd5e4005e18…

MALICIOUS

PDF

87.2 KB Created: 2021-08-19 22:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05c81a568fbad3936399d03cfa9feca4 SHA-1: f02ea9b40d5be6b715b0b296e2815272904c61c8 SHA-256: bcaefcd5e4005e18faec3409add8fc8488cf1ba562b71ffa1f207bce2f662573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous distinct hosts and the use of 'utm_term' parameters in some URLs further support the classification as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://educasters.co/ckfinder/userfiles/files/73429894423.pdf In PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/wusiwara.pdfIn PDF document text
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/66183891988.pdfIn PDF document text
    • https://turbooto.vn/upload/files/ribazigitab.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/d69eec10043fbfac6ba1e2a28a54ff73/93891993791.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/5556665805.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/5452023560.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/fepazufemutanovarapupuguz.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee33848bc---36173024809.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dff5e456a---59360933038.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/63409820917.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/59300753158.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/jekofidevodagonudajid.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/35592282550.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a552c0b14---46240864681.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ak3dmtce1j9t77f329p0btvjck/gekuxew.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082108e2ba05---98110725769.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d1fdcae9729849f355d56b7719813c0c/tenevugapa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d48dc6d55fe---jimawegixenosuzusunolijed.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2878bd853299448396ffc8c2c19ab153/sasikija.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad823f7a4df---95392473895.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/fupazap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=berserk+manga+download+redditPDF 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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 17308 bytes
SHA-256: 506a051c7a79c7115aa42278225874cf038c3b8739c6d4151a5d18688c032c49
font_01_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 10820 bytes
SHA-256: d3106548960b45c7a862a03c88203cfdf13d62dc8c89dec8f97e8ac65b49db88
font_02_sfnt_off000135d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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