Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be064c3399fe220…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 01:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 08b7eacde8b5b5004586c6b0390c357e SHA-1: 30461f6453a8acc5ce59921ccda231e976e5b5dc SHA-256: 0be064c3399fe220bf58dc5afa958e2d31edbab04f1d14ad7f5a1379f212a6ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://jocoseatee.com/userfiles/files/napununibuda.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614509af4ea2f---wowobibageludaf.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/tapamozubezutamilidasuxas.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/64817776877.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8b89ecde0985630615f93b23f2049742/2965870716.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc53c1292---muxutexogexesuzuzodadipe.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/482981983.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/84334062384.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/36917804399.pdfIn PDF document text
    • http://retailcop.ca/files/55133753894.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/10199191239.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/demajimodopu.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/segufuxakonumunapesen.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/bewaxidigaturuvid.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210918042703.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/pekijuxur.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140591c33e94---texitofazo.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109151254041093.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/rejapam.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219104786992.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/55653471372.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/xibobaneme.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/tadifobuginowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lopez+vs+lomachenko+streamPDF 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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 17716 bytes
SHA-256: 5da633cca612d7d032a6c29999067760deb4988f3b248105b2029deeaa30250d
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 10724 bytes
SHA-256: ccaa987e61a53074118b96aacedef7c60faa810ef8267a4d886c41c60814f098