Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca73a168c9ee519…

MALICIOUS

PDF

169.4 KB Created: 2021-06-18 05:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a71e600f7bcd70685cad390bc83eb3a SHA-1: fa56185e26a624b9041b533a93e5006917ea3a0b SHA-256: 2ca73a168c9ee519ed994ddeef1a44b60a3fcbb6550493db8165daefdc486615
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ik456gdeeu4j06utrdi3c0krh6/46823140502.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/k1rt3sj2v212af2k2ibc464ir1/wopanusofit.pdf
    • http://korean-school.hu/hangul/userfiles/file/lasulabopovixotek.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a607a3f28e---36282273996.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a7e2c5e10ed6c400765b56f612a8da5b/duzafefogunawavipogufitun.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/78233784173.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861119417a9---90188442799.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c0d9a0e12885f553df91249ae2c9fb16/55154195203.pdf
    • https://nnt52.ru/userfiles/file/movalitomokobunumiluf.pdf
    • http://cuboni.com/uploadfile/hong202106090448328034.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kg7kjq6r2jtvs783i2u8spo339/67038454704.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/fs29uv7keeo6mcucntuudhclc1/17372950248.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbb16df25---49121551426.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b5697d1ffbf5b8599320b10291e4aedd/webamunaposutezoka.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c44d9562677de7f3443e46ab2c4eca2e/nurilefitajo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=shin+chan+the+spy+full+movie+in+tamil
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ab12.bin
0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB12 6744 bytes

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