Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ae050a3dccb813…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 02:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c9d12cdf8bd98b02e098aaa00e3b6ac SHA-1: 04a15ffeec6d059333e8b27667d3a3f8a0151d0f SHA-256: 15ae050a3dccb8132acb1e4098858e06e4b1c5a80aff735c5352d6852838c522
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this file's purpose is to serve as a link farm. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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 https://butchercurnow.com/img/shop//contents/pufafa.pdf In PDF document text
    • http://bienchidan.org/uploads/files/xinevoji.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/faturawodot.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/funiwugijorewosaba.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/91394455709.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4d289cd9---zivoloj.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/77155830835.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/64297850222.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764e94cb78a---41776105638.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8da399fe7---85787178726.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/bibiforewijewi.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/84311609250.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/wawosovalikefumakisuneker.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085be189e9f4---sigewazawezedobem.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4bbe1e555be7a3442678af0126c1d733/72834077699.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/zoduzo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b090b397ed4---1609221200.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/48029330252.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/qrf94jmjmbk2j2e04f4f69vlus/zemaresumokemikaxoredesel.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106260147.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725ca7187cb---numevo.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/46674055375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=indigenous+communities+ap+human+geographyPDF 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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 11080 bytes
SHA-256: 01e17e2fdefdd3054260259254a2aa27a19565ac3f7944ae5b4535facdc6c15d
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 16860 bytes
SHA-256: 8c70dbea56fad77c42989fe0566987ac2ba9997253516b95d5b64a3a732c30c6
font_02_sfnt_off000133b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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