Malicious PDF — malware analysis report

Static analysis result for SHA-256 c642fad9fa7f4257…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 01:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da8e76a780c2e65dc22971a6a8770074 SHA-1: de45301acb5d07f4226273d1a01412c2636da2ff SHA-256: c642fad9fa7f42570f0151b69f0e3f288fe4d97658b0ee8bb92f97e6b79cce39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are probably used for phishing or distributing further malware.

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://chcial.ru/uplcv?utm_term=alessandro+baricco+city+pdf PDF link annotation
    • https://imad0c0.com/js/ckfinder/userfiles/files/fefilukezedafifed.pdfIn PDF document text
    • https://angkalaris.com/contents//files/damiruwe.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757df0534e1---62063861288.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec8ec2b32b---50120429490.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/80859884301.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/6749145576.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/61401171213.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160746c55bd327---42049741334.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/lakupekat.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/21049936778.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8gtj500b9eaiusghumc7vrrtst/soxusosilevokobakotol.pdfIn PDF document text
    • http://domosplast.hu/files/file/valapipox.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/82753519932.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/wupovudin.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/33107752394.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4f2aaba14---lupewoz.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/35248491058.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/55533624506.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/155d29710e2a83b8b078a00b09acc400/95377979734.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/gotaren.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/lemeturudavavopifaxas.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/812ccd70e4c0304b5ae8189e84ca6cb4/zasuroridituzi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/2970300204.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/55144899480.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/43608365373.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_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 10848 bytes
SHA-256: 06027ae152ef3137f199ac4035cfd02b993059afb0c477a7419c46dc0cf4a6f6
font_02_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 20900 bytes
SHA-256: da4e749a88b7320f40e03bdeafe4f1d74ba91ec457d917cd6f6cd9eb17a5592d

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