Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f0e2abf0ce8055…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 19:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d27843d0369f0c79580d3c55b1f15317 SHA-1: c7fb8bc75b287268f799e99a0f762ccf8cbe83ef SHA-256: f6f0e2abf0ce80552c9b9c88bdd72ac58344702e662cc8fad38c3f53f702f563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on what appear to be compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lensprovn.com/ckfinder/userfiles/files/92876431113.pdf In PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/kanevufisasub.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090203082873499.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6d48f2856b2bb40b13f09ea8ec8adf4f/51624600520.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/67924835154.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/75179605386.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/nepewurinowo.pdfIn PDF document text
    • http://gaudi.tw/upload/file/jojilemovabu.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109100751018245.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/78041069002.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c31ca3cdfd13067d8042e51fc00a0a63/wojixebixi.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xokimejuk.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/pibif.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/172190041.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/vajexobenosuwaf.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xikawuzineleriwifune.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/gobezatoj.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/wagizepugika.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/razakavapafomuxatawaja.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/69306753124.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/supinifit.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/82e4ea22eeae3957bb393a4318675f60/tozurovitekesusoxagitupad.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/80783130153.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/pakonola.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/99592590274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=papa%27s+cupcakeria+hd+apkPDF 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_off0000b369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB369 10468 bytes
SHA-256: db3e7e467e91b5403f91b932a567930261931b95325f4667ffb800c29d6f3f0a
font_01_sfnt_off0000cb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 15464 bytes
SHA-256: 6d7ab635e3ff8bbf1c0e579b7adfef934e4a1ba210b22b5e0aae171f7ebe6b1a