Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7f90a6e85942b5…

MALICIOUS

PDF

73.0 KB Created: 2021-10-01 07:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 377b413ce1e868aacc3ecb771cb3a870 SHA-1: a4f9b5bcc46dcbad5c856a2c6325f4f2fd6d0b9a SHA-256: ef7f90a6e85942b524c1914cb5b6fff6f69b7eee43ccac44e73a7f41e256b763
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/boxawidadotajenuwaja.pdf In PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/81924255940.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/jexolig.pdfIn PDF document text
    • https://webhosting4.net/media/file/84520379172.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c66b01832153a928602b73af0ab45ab7/zuforekibulabojitilot.pdfIn PDF document text
    • https://31app.com/userfiles/file/voseketawonoruzekofovus.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/jominorovox.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/59410327256.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/19226161915.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614941c156598---loredoxuwupijerimilale.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86475106758.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/fedimowatiwo.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/10672697231.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/bagojelekininunuxata.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/76272491632.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202110010102089040.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/64608660847.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/togivojoj.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/vobopazapoxozosibuj.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/lojirajamofi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0ojqbevs4j3plscp8vd82ud4a3/63207342071.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/63043340100.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/xuwunolovukiwufogizesif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=strategic+management+an+integrated+approach+12th+edition+pdf+free+downloadPDF 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_off0000b5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CB 17536 bytes
SHA-256: 11f42620d64a1e4de73b8b221479dae86e2be1b5826c4b740517788615ff968b
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 11232 bytes
SHA-256: 8694b9ae829da3159566df32697e999ccd361f966d74258d9196333807d0ca7c
font_02_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1