Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d100e07610b265a…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 10:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a3bfeb086afb69374890ab3177f321f SHA-1: 283f382b2d6eebf3213ccfade9152dfc899264f7 SHA-256: 7d100e07610b265a0de1b309625852716cd4d8fdb5eeecbb92b310887f143c5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://chcial.ru/uplcv?utm_term=a+fishing+rod+is+an+example+of+a+lever PDF link annotation
    • http://3qlohas.com/CKEdit/upload/files/xewemewevasewawedogaxegi.pdfIn PDF document text
    • http://clingac.com/d/files/12350683476.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/porugunabun.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/58532177567.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161370ed3d2e78---12461084765.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/57184067290.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/fuwezomuf.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/nafoworeledap.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145949bf1ba0---supawajofidadivap.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/3158870945.pdfIn PDF document text
    • http://sun-tes.ru/files/file/33667424597.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/43787639776.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219222237404452.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/56398537635.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/lonewo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8ae6d51373ecb5eee127b5d72e2c245c/21028107644.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/51700019476.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/de5dfa5799467909d4598e8f4fc4e8d6/tenuduvoruniginev.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210913_211757.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/47803503020.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5r4sk0lf6hh5j9kqhfqdl0lrk3/vuwani.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1615216f6012a2---491208049.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615006a4e0393---86623598254.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/4735533253.pdfIn PDF document text
    • 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_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 16044 bytes
SHA-256: c7515faf1be42a6ede34034df57529fb6b3e8fc541a17ccbeb78259868b9a2ef
font_01_sfnt_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 10996 bytes
SHA-256: 39eed3c412d3822b5c54b5eb5511c2626a0355e94443ffa9f9101357f10329f9

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