Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b2e7a2d366860c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 16:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbabd3062aee5132f17712139bced201 SHA-1: e27fdd36a6ae028f6f35e0eedfa2079767fe3b93 SHA-256: 40b2e7a2d366860cd649e5e7f5bb9aed60595081e4b6e721b49d05adebb1522e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The embedded URLs are designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=a+boy%27s+best+friend+isaac+asimov+pdf PDF link annotation
    • https://themalc.org/files/file/potoleve.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613074e732a9c---90453656082.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/tatudeweriz.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/11570615600.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135418264515---32371612480.pdfIn PDF document text
    • http://bndweb.nl/upload/files/30576605144.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/jakezumaladusiduxel.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/pavuzukikufemesuro.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/52504693759.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/10551573206.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/zofokurefi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161372b611b720---mapotaxominaz.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/76068917319.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/60e6fa9d1dadb9977870c5137c88b906/letojamawilakofide.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002c2706d1---sotabajaxivuxitasovoputaz.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/tubodaxafufeke.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/55899971654.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/fatoka.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/zodipofipetodorawo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/81779449cd0ac895a2b7db2d652a244c/gunawegoribupisamokivo.pdfIn PDF document text
    • https://wonkingchina.com/d/files/85361167690.pdfIn PDF document text
    • http://elitvorota.ru/f/file/5937217555.pdfIn PDF document text
    • 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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 11072 bytes
SHA-256: 6eebf23a508a40dbe5a139b365b26003785d330e7f33174555901c2ae9e747c3
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 20236 bytes
SHA-256: db7d10b6f4da5a5f18d632aeeb22903856141a6458dcdca787271b1158ccb9b8