Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f4e599bff48ea9…

MALICIOUS

PDF

93.4 KB Created: 2021-06-29 15:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 72c5b7480c447344feaeaee847b5077e SHA-1: a172ffc3ddc9ab06957cbc4f3b2a936753214054 SHA-256: b8f4e599bff48ea935061041521b2537a920f7f2642cd8e47e1b226e5d225ec6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d1dca7220413e99588376272ec3c88f1/dufesizasajovepikebum.pdf In PDF document text
    • http://viprealestatebrokers.com/userfiles/files/webusigijivivitazolexe.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099d614a7af5---56132535766.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7c4482239---5123628316.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a7be0c61---54029664291.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfb2a2cd0f---65433780104.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/melokagimolobefa.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f456fabf6b44ee60597781b820a9b872/26576246869.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/bipevuwuvetusaloborigij.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/46873516139.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/baf373008e1d7ff9c17ac543325be41a/19684323998.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160960e3597808---zipekuzebejosawefat.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/nagukebokebu.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/11651393670.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/4759616806.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9cc899c67---69350190667.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/99913693743.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae30b5115---xavezexafaxusetivamuba.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/66d15dd8cd24f94cabd7335dd00e6823/forizozesixepudolozujum.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9649f1c47---jagus.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7e0589c0d5693778c715793045f73624/lawusexelarupifivugatol.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b575d846b---14615024950.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a24eae3c339---dumesizeta.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f5fb2eabb9c7fec6769ad65d714e3b76/3688379276.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607617d6557eb---tisizinamasuvinetiter.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=proper+way+to+hard+boil+eggsPDF 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_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAB 18040 bytes
SHA-256: 2a3794227c4335a9bc401cd42acc797249d7f914b82ae9a28569ae8c3fe627b9
font_02_sfnt_off00014f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F1B 10908 bytes
SHA-256: 1d38d7f937e21cf6fd2c73c6d9c8488f39edd942d51965475b1f4a40c99e552b