Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ece4de892ace30b…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 16:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5efced36c3b39e46198b8b4ff3a39c2 SHA-1: 5b96b5f3ff7d294e6d193cd0a65ae474f6e25c54 SHA-256: 5ece4de892ace30b67ab0aa570113b58852aa86e831b3d6d65544c44a5f390c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://huntic.ru/uplcv?utm_term=psp+emulator+xperia+play PDF link annotation
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/vitufefesosenil.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/pivevapekidejexut.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/35332421091.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/63290518052.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sejotogerobenodilubivevu.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/funoboxoxagodemiluvo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de2f2c0a65---ganigivosudeginex.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-8/20210908142136498831.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/79026020578.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/zitem.pdfIn PDF document text
    • https://verner.lt/images/files/vumon.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/40434714007.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/nurutamu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7dd398b43844ef5823400de1ccc76fe1/kazepegemezoraw.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371157d6cbf---bosuxebegowurofagin.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef335b2f68---44984650358.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/tujaxolawef.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/fogadusigudadafov.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161354ac080f8a---vebekasisarokidutovibevo.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/6004390520.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/76158495847.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/jevijuloxepapakolamajobi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 23932 bytes
SHA-256: 176d77cf48eb1b0cfa7ab560f5f1c4eb6201ec699e29ffc1a351974f7c1d835b
font_01_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 2128 bytes
SHA-256: 67da80f36b9d5a906396eed84e4e6eb230a9df44e0610016aadaa9f351a20f13
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 10628 bytes
SHA-256: d3a4b2ffe2b164a14b09f0d4778654cab9963d9e635f19a7843b0fdcf6928683

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