Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d8220151f063d3…

MALICIOUS

PDF

71.1 KB Created: 2021-10-02 20:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 366970000c5b1250c7295c6c2e33e3c6 SHA-1: d1189df967206b2a11a4954c5fb923e3651186f9 SHA-256: 58d8220151f063d32a71c4b1b9a82bbc09bfcfd38891bcead29699436dcd0adc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. Although no scripts were directly extracted, the nature of the link farm and the detection names strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.netcorp.hu/data/editorfile/wulimugilefaxetarel.pdf In PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/1885902174.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/pojer.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/5012276431.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/6409518453.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150cf8555b69---22698575656.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/tototavosoroxeruvorufo.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210916185740.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/68860952698.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/lerijabaretigefodapezoz.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/169c7ecd0971dce02c1683232a50748f/tobepavabubob.pdfIn PDF document text
    • http://charontrade.hu/data/file/40294585047.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b62f5347ad---43910760602.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202110010614161454.pdfIn PDF document text
    • http://thcsnguyenvanhuyen.hoaiduc.edu.vn/ckfinder/userfiles/files/vomaxi.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/68584208410.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/dawosebozopodemazerol.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/77812817606.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/36903303630.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8b7ee1ad---dineva.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/rakabazanewen.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/rasitenapepakevunevu.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/40023349397.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/89i28qhrl4e16t5mbct0m7hmm1/ribunetitamisuj.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/60321423919.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/pibujofasaxasema.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/zatisefodudekidoreb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=orthodontic+camouflage+class+iii+malocclusionPDF 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_off0000b6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 14936 bytes
SHA-256: b7f362dcebb99681b58c495a58d012edc79975fce5583d5d00c84cfa6e81555d
font_02_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 11048 bytes
SHA-256: ff22091ea0fd5af6a5fe6f3c753b718087d277278b737d440f63e5aa08bd4fb1