Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac5914691784b25…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 13:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f7a86fcdf48333885728f9a070449fc SHA-1: 54454ba388d087794815f0f98ce62d35e93aafaf SHA-256: 2ac5914691784b2525fcf42a44b941ae7d2646e597d55a2cd26c11358b6290a1
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL analysis point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9156

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 http://angelofthewinds.org/ckfinder/userfiles/files/58984753466.pdf In PDF document text
    • https://lemarko.com/userfiles/file/67741885433.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/xugakuro.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovvvr49ahn0jktqi2tjp3hgufn/sazozaru.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/44347144955.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/seloxajakelijadada.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/33312760253.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4ac817c49fd6dac5f0f06b34c1efa7df/nogopajeguginafub.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb7861ee24---pusufejejelapufavaw.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/76801032040.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/dawuxebujiri.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zuzinujijo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pigisa.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/papekinasonale.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/62870362405.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/repivolojovapuxoropaza.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/35067485919.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/75308086361.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/26863768920.pdfIn PDF document text
    • https://t2sc.me/userfiles/xusifunujabasoraloninenug.pdfIn PDF document text
    • http://vaithun.net/upload/files/94373818601.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210911_5FE517C33B0E989E.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/setinotewubitujunizori.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99497d544---vefomisadevulirixo.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/22768871940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ram+cleaner+appsPDF 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_off0000df33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF33 17472 bytes
SHA-256: f6ce999b8fce3ff2deed75bcbea9a81a7f3acb0e2ffe634ac7c25ebc31615ad6

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