Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8570d8d0073767…

MALICIOUS

PDF

85.6 KB Created: 2021-09-18 00:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e4573056f4ef308210b76c8ed2908b3a SHA-1: 29d61ae1cd11b981b3eb039117ac58b02ada4292 SHA-256: 2e8570d8d00737672b7fbffef5d0dbb1f240bcc08be25d0860fb3ca3373800a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. The presence of embedded JavaScript points to potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=vokabeln+app+android PDF link annotation
    • http://zzfcw.com/file/fkimg/file/43489962794.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/lupalomowefelagexiratul.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/24005951639.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bcee59100---pudosilidesip.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210904_BD1FB669986D1DFC.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/sepumibajakudota.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/10787384964.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/31946102573.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/85107531488.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/xoguwinuw.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/18409985743.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lsaah2j1spffvjfr23abgjl6pu/42707576681.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gigixekefagovaderexur.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/34900965951.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/raxudurefererulijixajumuj.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/tulizu.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/nasepuzalerelusirimi.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/duvufafe.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/vibav.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/1712028332.pdfIn PDF document text
    • https://securitydm.net/slicice/file/82386944065.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/dojatokuduzidoso.pdfIn PDF document text
    • http://davobio.com/upload/files/91708819701.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/c91b00514022f00ab6aba1c11f88ff1b/76482722915.pdfIn PDF document text
    • http://turnyras.lt/Files/file/11643664184.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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 10320 bytes
SHA-256: ffea821169ee0f919aa30f0e3a3e55be6ed79b5619bea469b87631fa850ffdc4
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 18056 bytes
SHA-256: 9669b8c3f850b8b5465f49b5914d14e7b32c4fc6db70e9bbe6a5a72eb6218ffd

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