Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e77a0fa2487b98…

MALICIOUS

PDF

95.5 KB Created: 2021-10-09 02:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 28455f6c78bcd285eca0cde4f5a923a6 SHA-1: ebf0adb897e3ee18638ec5888c86ee8926e6cd81 SHA-256: 28e77a0fa2487b9831cef5708ce27e886c48f7bc66673b27cbf1aca99d613861
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to direct users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, suggesting the document is designed for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://vhz.cz/user-files/57408107411.pdf In PDF document text
    • https://etevent.itweald.com/uploads/files/613cfb1e30046.pdfIn PDF document text
    • https://sentralperdana.com/file/95889680366.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/95895159405.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/febipabegezuzilabemudekab.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/kokomufedojuledujosa.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/62317529372.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/44674994108.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/vilipowawirigodilizogopu.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/53198600415.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nenefezonajumefelepilol.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/31941196860.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613040d37a14e---36882757644.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/mimijozinazoliwulutegif.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/55885203664.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/gupuzatogizo.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/lejonimedarojap.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3f9b72669457c0faa16bda3448530586/moposuxedosijipuxotuzupo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ndtn468hrljkvu3t0ten708i8i/68624480222.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/bibinonejaravafedo.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092811175573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=touch+my+bodyPDF 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_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 20652 bytes
SHA-256: 57dab71ba55181e98a14bab469bd323df55aec98e88515a178e8bf6a354ca333
font_01_sfnt_off0001424f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424F 10048 bytes
SHA-256: 90a0e672e44fd8a22578bc50b6de77f45b412570a549002c53623e3102fb2c4e
font_02_sfnt_off000158a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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