Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cec473ed674a8e…

MALICIOUS

PDF

73.9 KB Created: 2021-09-27 16:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dd44db5486f4b8a0fc7bc90c11cc226a SHA-1: 2520c2cffe2b30c0083f2c941d4bc929543dcee1 SHA-256: d4cec473ed674a8e241fda5705b3fb877c03984c3c7a24346e2b7e428211d564
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://capital96.com/userfiles/file/pimogilonisipazarokad.pdf In PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44314692856.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091913123516.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-12/20210912055650590442.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/8388910669.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/pogorusumokujodezinebiv.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/meximerelefopo.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7lhtmh7g2sof49pdq27c26qvn1/68102130304.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/larekevoxuleganupikeporu.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/92414213466.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210916_2930571F36290195.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/90786408854.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/zodagixemoz.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/14630773238.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vuxazanepopixoze.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/11966439887.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/41602369851.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210921144454811.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/mrak27o9696gsujb33stj5b2ou/90168432914.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/27763065824.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/tavodogeso.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/tabezu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee55102fc---35418411844.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/8260059175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fast+and+furious+9+french+streamingPDF 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_off0000bb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB25 11120 bytes
SHA-256: 69af85ad44dedc80da15d829fb17da5f23421048ec16b318ce66c03ffde58818
font_01_sfnt_off0000d4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B8 17604 bytes
SHA-256: 2e3fd8729efa1dc5915366a66a7690c4bd987481dcbd07d7c2f0b5446ce3fd95
font_02_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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