Malicious PDF — malware analysis report

Static analysis result for SHA-256 9710d199bf216ad3…

MALICIOUS

PDF

76.2 KB Created: 2021-10-05 18:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1b13928498904e284f2a5b244f376b19 SHA-1: a656ead37f4f65de7f0b27896cf78d91a864a031 SHA-256: 9710d199bf216ad38822b1ee87a9388b7ac7aa3e3bc1d9f02e22b4414fd73a4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS upload storage or are structured as link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=wotlk+rogue+leveling PDF link annotation
    • https://fwstc.in/userfiles/file/73236864097.pdfIn PDF document text
    • https://totounited.com/contents/files/23785973152.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/86774848381.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/gizekuwepivanubujapam.pdfIn PDF document text
    • http://ustunongel.com/image/files/modal.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/60307571165.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/26106834396.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/63266362187.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/dipiviwaxexexalagisanu.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/sameg.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/80884419341.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614780e16c752---rafezafijimez.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/21982384511.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/20838832358.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/5d61859fa4e71bd39e6704433be6a597/1982783937.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/22326039651.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/dizaxidilimofitevid.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210925_113447.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bb56a9cd90---14504389913.pdfIn PDF document text
    • http://yoron.net/up/files/12714163670.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/92527909240.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/xamujalufo.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/24756780498.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_off0000c2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B4 19232 bytes
SHA-256: e0abe6e9eb0686d471823fc89bc6919f66e11e66644424bcb3900f2a4809fab7
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10204 bytes
SHA-256: ab2ce6e1eeee109c845e5223ee8d089a30d5882508c3c76246dd3cb43e451b3e

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