Malicious PDF — malware analysis report

Static analysis result for SHA-256 287d0243eeca83e0…

MALICIOUS

PDF

62.3 KB Created: 2021-09-01 10:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: be6a4233c119a870a9edc22398246011 SHA-1: 559aeb498eddd6a8a301a532a0dff021e245ecb2 SHA-256: 287d0243eeca83e09d83c3974a91ed20119cd4796610fcea10e0c20e964cdc22
154 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS uploads. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9075

Heuristics 5

  • 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
  • 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://trunglamdecor.com/uploads/userfiles/file/demolugumanodal.pdf In PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/cce0ce7ea77258975570dc5e2bb78168/47355215109.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda816526c---49991596776.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/kupipaxase.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160735cc71c178---34625626824.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/petunofunulufoxuxevo.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/6623549133.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608581ac3289b---96841685184.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/dufosogaxodepafovaniji.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/29615064442.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f31c9cfe7ec9bb39d56eb85f4f903ad0/wokinikirixexerosu.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/2603468998.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210530164437.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/272694831.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/kozovonobadojuduju.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/vavakiw.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/2220096981.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/bugokagonopetaweweko.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/logekifudewobopudo.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/jularokamub.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/7066541652.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/vetekigatukuviborux.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/wobunafinupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+connect+speaker+to+alexa+echo+dotPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B3 17016 bytes
SHA-256: b4ff3b5b4bbc1f9da7306d2d876bc71d318e12dda83c77dabd657c1ca262aae1

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