Malicious PDF — malware analysis report

Static analysis result for SHA-256 872a90f376d6fbde…

MALICIOUS

PDF

75.9 KB Created: 2021-09-13 16:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b882338e4a150d36cc271d3a178d7a2 SHA-1: 782f48aa2b1473ceb96d375d41ad59f981257ff1 SHA-256: 872a90f376d6fbde0fc91e25c2a05cc5b6b7384c56462390ea7d09fb90495028
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting. These links are likely intended to redirect users to malicious content, such as phishing pages or malware downloads, as suggested by the 'download resident evil android apk' UTM term. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=download+resident+evil+android+apk PDF link annotation
    • https://rux-thai.com/ckfinder/userfiles/files/68231504237.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f2b41d56---13210023776.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae2f315a5---68401297126.pdfIn PDF document text
    • https://12shio1.com/contents/files/49283502498.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237cc3da40---nekatotukuxamum.pdfIn PDF document text
    • http://labotinnghia.com/img/files/wuxoluwobetaritesugob.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/lepamimejomolewo.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/xorod.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/73477135110.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/zewemebosofelidakaxubati.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/beb5750fb792e492c9232ed8f5f61761/gikajojibinawap.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/gaginutawegubuwowatiw.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/dipapirobavifurok.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/vaburakuba.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/32671982433.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e10eb1a541---farowam.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/5685240693.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/51806974205.pdfIn PDF document text
    • https://rajaunited.com/contents/files/kexibosana.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/91524367015.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e4cf7c103eb0c36daa2f3ec2da47bc82/lutozuzoziva.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905225145.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/23477727193.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f707eabcba---68060933515.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_off0000c54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54D 10628 bytes
SHA-256: 5128bf10bc8a4de8278862e4dd4270085baeb70085a1302d48a82cb1fc39bb08
font_01_sfnt_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 17148 bytes
SHA-256: 61b9d8b1f3749533f40fa67b481b2716e29e06652313fbd50a8e9bca5e2a5850
font_02_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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