Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee9e4cedfeb823c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 05:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52daa6997ea40858b181255bf92abada SHA-1: 25211fa31db4f6dae851f37f742d1ca45084c919 SHA-256: 4ee9e4cedfeb823ce0988469b79aad91378c54a055d814b57041906b671fbeb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristics indicate a malicious intent to distribute further payloads via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/04f2ef607325b186265a8899bdbbde9d/38477281383.pdf In PDF document text
    • https://airflow-skateboards.com/userfiles/files/xovosanuri.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/12078733050.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6606136b1---muxijeludiborituxasudonuv.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/vapukotefeduzuluvovuz.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/79646353073.pdfIn PDF document text
    • http://quangcaowebsitecomvn.xemlaco.com/uploads/files/97356849209.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/tuwumema.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/xuxarimafigepexidapesopu.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914075337.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/70885047335.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/nosozugibifo.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/kulumivo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c72f076082eef48426e522408ec03840/zupesesafegizodixu.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/padufibuvavufurufa.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/37739756946.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/xigigizewagaritipibonuxij.pdfIn PDF document text
    • https://melz-feu.ru/upload/figopanejibes.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/jirazokizuzomepof.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/zasigigen.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1973311aa---kimon.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/xizux.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/38338204635.pdfIn PDF document text
    • http://balone.net/_upload/file///gukusuviralegovewu.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/49753105989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dont+breathe+fmoviesPDF 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_off0000bd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 10640 bytes
SHA-256: ce1c48ef9372cb2dd495cc7ab15f234f75893d2c98604d39f9b7eaed1674bc65
font_02_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 16124 bytes
SHA-256: 5e8019f5b80f4058f481577cdce03aa27f4ab66d803f31766560e7ecea8afd17