Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc6a16dc52de17f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 04:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 26f33575747b44df9eadd1e84853a4f7 SHA-1: e40a9ed2a9d2a531da54aa712b15b9ff2d2d866a SHA-256: ddc6a16dc52de17f2164aecf1d3f26ec9d7c0c10cd91c4b5d508e1dbb336ca0e
124 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests a phishing or malicious redirection campaign. The primary goal appears to be directing users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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://philabc.ru/uplcv?utm_term=calculator+lock+apps+download PDF link annotation
    • http://goldartline.ua/userfiles/file/jiseniwedabazusitujeb.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/20453082252.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/84725831621.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/36326904920.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139466e4a79e---2307648802.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe6297cb9---23999736103.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/l5173em3u76gi5ikfie22c39pj/zesekitej.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d89ef160f17d56fb4803f4b39006d65a/99291942404.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/xotonerumekodo.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/47838717280.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/64130007984.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/loduridap.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/siluz.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/wulisumifu.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/rizubinarelogemofewezetu.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/82726224427.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/3973535548.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/somabixorig.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9412884db1bfa792e0f21d6361fcc847/suxazemoduzuxosokujibibaf.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/37835034146.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/bujurasu.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/vedodapimejefufuxotug.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/buwitanojetawabuvobixula.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 18616 bytes
SHA-256: ee2a04a444d6ba748447a31c41f8ba350a7c9862fab8e88bbe2a0568c8793496

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