Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5cf6f0b1b1f6a5…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 12:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e6723f3b4f57b889bc9047a8d1c7dfa1 SHA-1: d27a9eed8690d5db11ea515894113c60a561da52 SHA-256: 1e5cf6f0b1b1f6a5417bce77e8ba15d335d789f3c5e585bf5735f18ce23cda3b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URIs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and a link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=how+are+stock+options+taxed PDF link annotation
    • https://mcgbaharat.com/userfiles/file/nezedaxubazozenojezefati.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9c0d3123a---22797055879.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/dodexotilozeduxofelivere.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/sodiginirinelatebazor.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gawigogegegozemulibulido.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16146bbfa517cd---36239898568.pdfPDF link annotation
    • http://reanda.com/jingkelun/userfiles/files/20210912152959.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/tusadebab.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/45875394988.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddc7aafe47---2089700573.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/11287900508.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/57567788117.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/tubodozefixorerojigute.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/zizekejisodurasaxoga.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/43265054461.pdfIn PDF document text
    • https://shaksheer.com/app/webroot/upload/files/99096164609.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/wubovedixalaluva.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135683cd9623---kitababijojuxanisonoribox.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/73169171582.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/sizikagenavagabetuliru.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/xojimanika.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/finesudomi.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/44721428934.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_off0000ae6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6B 10732 bytes
SHA-256: 79963980a502282e55bc9bc71bb921312b05a505c8e18db55e8cda5ed733f32c
font_01_sfnt_off0000c744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC744 16464 bytes
SHA-256: 6b69e117e9591f38fd50b106197e7cd072c1b6d97cb632ae0d14bde6fa9f9768
font_02_sfnt_off0000f129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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