Malicious PDF — malware analysis report

Static analysis result for SHA-256 53eafd06dab43394…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 15:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0453c4f1597d8b64fc440cd572631f5 SHA-1: e145df94017834082029ab65420844d5b6f8890a SHA-256: 53eafd06dab43394889272fb0ec9f6b02380adb64a598c14e68682c17baa0177
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a link farm structure, indicating an attempt to lure users to external sites. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests malicious intent. The URLs point to compromised WordPress sites and other domains, likely serving as part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=instagram+followers+increase+app PDF link annotation
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d97517fb4ad771ac6d9db2dabc89265b/61161369094.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/58451099825.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109041359141133.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091110522240.pdfIn PDF document text
    • https://digireg.es/upload/pepise.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r54i1k2dun0o0iqcrjhu5h9t6i/mutisurezura.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631343534zenetumog.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/zigefil.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/49286519127.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab8e1576d966d851394a35993d5f465b/81616791203.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/mibovilegugarukolazizuma.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/gixupokuwitozodebe.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/10647910610.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/pevilagugurufuzifepaf.pdfIn PDF document text
    • http://leton.pl/userfiles/file/vuloronafijezeru.pdfIn PDF document text
    • http://glassick.com/userfiles/file/zefugezalivogigivume.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/dafinulekabezopabizalimo.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/tuzediwesevo.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/44527953328.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/52120916221.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/28697222780.pdfIn PDF document text
    • http://vititanon.com/user_img/files/48791203351.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/57040019894.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/29569984743.pdfIn PDF document text
    • http://sgpeo.pl/users/file/32079730872.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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 10860 bytes
SHA-256: a0359c117364cf877caa0144373a8107b03469dc08a892b9f496932bcffda57c
font_01_sfnt_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 17504 bytes
SHA-256: 57299bea17305dafd43aa3ae25dc8238e322fc82afeac0363a14e6dc6204f83f

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