Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27fa58ce64bd484…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 06:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8bf9dd26eeff6c2cc8156a6f496de826 SHA-1: da50b08bd1ecdc3cdf1b57599d6dc33eecd6ced4 SHA-256: b27fa58ce64bd48462f701f668d66cc2ff2e80748e6562d15fc428716ff10261
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via a link farm. The embedded JavaScript may be used to further obfuscate the redirection or initiate a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zulassungsservice4you.de/bilder/file/nadobowibedipox.pdf In PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jusosumifino.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/witobodovavodato.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6jilhu27b605kshoa1qr4nrif5/vuvarigokatudi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/79e790428ffb364e5aab6a245444aad1/firened.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/51039364215.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/190530b1b4df59689a69888a33e3e701/95417439241.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/kuwiwadoxudivelivemaju.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/migobalad.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/86927987919.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/34967277343.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0562c264d1---33894916546.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31caa900f---logimuwiror.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7dc12a12a6b6fca45b1d12974b2d5d8/magutato.pdfIn PDF document text
    • http://goldmustang.ru/files/files/nerusezibekewawal.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/46863842999.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/faxaja.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/57807367885.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/akq1td16a0i90jim1783jq3i36/lowarapilosoravuxaxitu.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/tugamigotatedipudikofa.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/4275901084.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/zidabubewevebuzebowamivu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef56c5f3bb---salasedugikizugozisopoxej.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210901023100.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/bojuzatewaditavez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=isoptica+en+arquitectura+pdfPDF 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_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 19528 bytes
SHA-256: 6a46e41a082c60a584eabfef7420b05e9094d6943ec360ae011e2b054ff63aef
font_01_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D41 10764 bytes
SHA-256: a784e1242450ae66e0279f922ed60e8477eb65a1f7bb078df256490fedff4865